Office of Weights and Measures

<!DOCTYPE html> <html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# "> <head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=HxkREWBo" charset="utf-8"></script> <script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("https://www.nist.gov/pml/owm","20230202013940","https://web.archive.org/","web","/_static/", "1675301980"); </script> <link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" /> <link rel="stylesheet" type="text/css" href="/_static/css/iconochive.css?v=3PDvdIFv" />  <meta charset="utf-8"/><script type="text/javascript">(window.NREUM||(NREUM={})).init={ajax:{deny_list:["gov-bam.nr-data.net"]}};(window.NREUM||(NREUM={})).loader_config={licenseKey:"37b7ccb661",applicationID:"1089704227"};;(()=>{var __webpack_modules__={507:(__unused_webpack_module,__webpack_exports__,__webpack_require__)=>{"use strict";function detectPolyfillFeatures(){const featureStatus={};return checkAndAddFeature("Promise","PROMISE"),checkAndAddFeature("Array.prototype.includes","ARRAY_INCLUDES"),checkAndAddFeature("Object.assign","OBJECT_ASSIGN"),checkAndAddFeature("Object.entries","OBJECT_ENTRIES"),featureStatus;function checkAndAddFeature(funcString,featName){try{let func=eval("self."+funcString);-1!==func.toString().indexOf("[native code]")?featureStatus[featName]=Status.NATIVE:featureStatus[featName]=Status.CHANGED}catch{featureStatus[featName]=Status.UNAVAIL}}}__webpack_require__.d(__webpack_exports__,{n:()=>detectPolyfillFeatures});const Status={UNAVAIL:"NotSupported",NATIVE:"Detected",CHANGED:"Modified"}},2687:(e,t,r)=>{"use strict";r.d(t,{Z:()=>n});const n=(0,r(2141).ky)(16)},1719:(e,t,r)=>{"use strict";r.d(t,{I:()=>n});var n=0,i=navigator.userAgent.match(/Firefox[\/\s](\d+\.\d+)/);i&&(n=+i[1])},3524:(e,t,r)=>{"use strict";let n;if(r.d(t,{H:()=>i}),r(8438).il){const e=document.createElement("div");e.innerHTML="\x3c!--[if lte IE 6]><div></div><![endif]--\x3e\x3c!--[if lte IE 7]><div></div><![endif]--\x3e\x3c!--[if lte IE 8]><div></div><![endif]--\x3e\x3c!--[if lte IE 9]><div></div><![endif]--\x3e",n=e.getElementsByTagName("div").length}var i;i=4===n?6:3===n?7:2===n?8:1===n?9:0},5970:(e,t,r)=>{"use strict";r.d(t,{Mt:()=>_,C5:()=>s,OP:()=>j,Yu:()=>g,Dg:()=>f,CX:()=>u,GE:()=>b,sU:()=>I});var n={};r.r(n),r.d(n,{agent:()=>m,match:()=>x,version:()=>y});var i=r(4580);class o{constructor(e,t){return e&&"object"==typeof e?t&&"object"==typeof t?(Object.assign(this,t),void Object.entries(e).forEach((e=>{let[t,r]=e;this[t]=r}))):console.error("setting a Configurable requires a model to set its initial properties"):console.error("setting a Configurable requires an object as input")}}const a={beacon:i.ce.beacon,errorBeacon:i.ce.errorBeacon,licenseKey:void 0,applicationID:void 0,sa:void 0,queueTime:void 0,applicationTime:void 0,ttGuid:void 0,user:void 0,account:void 0,product:void 0,extra:void 0,jsAttributes:{},userAttributes:void 0,atts:void 0,transactionName:void 0,tNamePlain:void 0},c={};function s(e){if(!e)throw new Error("All info objects require an agent identifier!");if(!c[e])throw new Error(`Info for ${e} was never set`);return c[e]}function u(e,t){if(!e)throw new Error("All info objects require an agent identifier!");c[e]=new o(t,a),(0,i.Qy)(e,c[e],"info")}const d={allow_bfcache:!1,privacy:{cookies_enabled:!0},ajax:{deny_list:void 0,enabled:!0},distributed_tracing:{enabled:void 0,exclude_newrelic_header:void 0,cors_use_newrelic_header:void 0,cors_use_tracecontext_headers:void 0,allowed_origins:void 0},ssl:void 0,obfuscate:void 0,jserrors:{enabled:!0},metrics:{enabled:!0},page_action:{enabled:!0},page_view_event:{enabled:!0},page_view_timing:{enabled:!0},session_trace:{enabled:!0},spa:{enabled:!0}},l={};function f(e,t){if(!e)throw new Error("All configuration objects require an agent identifier!");l[e]=new o(t,d),(0,i.Qy)(e,l[e],"config")}function _(e,t){if(!e)throw new Error("All configuration objects require an agent identifier!");var r=function(e){if(!e)throw new Error("All configuration objects require an agent identifier!");if(!l[e])throw new Error(`Configuration for ${e} was never set`);return l[e]}(e);if(r){for(var n=t.split("."),i=0;i<n.length-1;i++)if("object"!=typeof(r=r[n[i]]))return;r=r[n[n.length-1]]}return r}const p={accountID:void 0,trustKey:void 0,agentID:void 0,licenseKey:void 0,applicationID:void 0,xpid:void 0},v={};function b(e,t){if(!e)throw new Error("All loader-config objects require an agent identifier!");v[e]=new o(t,p),(0,i.Qy)(e,v[e],"loader_config")}const g=(0,i.mF)().o;var h=r(3524),w=r(9206),m=null,y=null;if(navigator.userAgent){var k=navigator.userAgent,P=k.match(/Version\/(\S+)\s+Safari/);P&&-1===k.indexOf("Chrome")&&-1===k.indexOf("Chromium")&&(m="Safari",y=P[1])}function x(e,t){if(!m)return!1;if(e!==m)return!1;if(!t)return!0;if(!y)return!1;for(var r=y.split("."),n=t.split("."),i=0;i<n.length;i++)if(n[i]!==r[i])return!1;return!0}var E=r(2141),S=r(8438);const O="NRBA_SESSION_ID";function A(){if(!S.il)return null;try{let e;return null===(e=window.sessionStorage.getItem(O))&&(e=(0,E.ky)(16),window.sessionStorage.setItem(O,e)),e}catch(e){return null}}var q=S.ZP?.XMLHttpRequest,C=q&&q.prototype;const T={};function j(e){if(!e)throw new Error("All runtime objects require an agent identifier!");if(!T[e])throw new Error(`Runtime for ${e} was never set`);return T[e]}function I(e,t){if(!e)throw new Error("All runtime objects require an agent identifier!");var r;T[e]=new o(t,(r=e,{customTransaction:void 0,disabled:!1,features:{},loaderType:void 0,maxBytes:6===h.H?2e3:3e4,offset:(0,w.yf)(),onerror:void 0,origin:""+S.ZP?.location,ptid:void 0,releaseIds:{},sessionId:1==_(r,"privacy.cookies_enabled")?A():null,xhrWrappable:q&&C&&C.addEventListener&&!/CriOS/.test(navigator.userAgent),userAgent:n})),(0,i.Qy)(e,T[e],"runtime")}},8873:(e,t,r)=>{"use strict";r.d(t,{q:()=>n});const n=["1222","PROD"].filter((e=>e)).join(".")},1925:(e,t,r)=>{"use strict";r.d(t,{w:()=>i});const n={agentIdentifier:""};class i{constructor(e){if("object"!=typeof e)return console.error("shared context requires an object as input");this.sharedContext={},Object.assign(this.sharedContext,n),Object.entries(e).forEach((e=>{let[t,r]=e;Object.keys(n).includes(t)&&(this.sharedContext[t]=r)}))}}},2071:(e,t,r)=>{"use strict";r.d(t,{ee:()=>s});var n=r(4580),i=r(9010),o=r(9599),a="nr@context";let c=(0,n.fP)();var s;function u(){}function d(){return new u}function l(){(s.backlog.api||s.backlog.feature)&&(s.aborted=!0,s.backlog={})}c.ee?s=c.ee:(s=function e(t,r){var n={},c={},f={},_={on:b,addEventListener:b,removeEventListener:g,emit:v,get:w,listeners:h,context:p,buffer:m,abort:l,aborted:!1,isBuffering:y,debugId:r,backlog:t&&t.backlog?t.backlog:{}};return _;function p(e){return e&&e instanceof u?e:e?(0,i.X)(e,a,d):d()}function v(e,r,n,i,o){if(!1!==o&&(o=!0),!s.aborted||i){t&&o&&t.emit(e,r,n);for(var a=p(n),u=h(e),d=u.length,l=0;l<d;l++)u[l].apply(a,r);var f=k()[c[e]];return f&&f.push([_,e,r,a]),a}}function b(e,t){n[e]=h(e).concat(t)}function g(e,t){var r=n[e];if(r)for(var i=0;i<r.length;i++)r[i]===t&&r.splice(i,1)}function h(e){return n[e]||[]}function w(t){return f[t]=f[t]||e(_,t)}function m(e,t){var r=k();_.aborted||(0,o.D)(e,(function(e,n){t=t||"feature",c[n]=t,t in r||(r[t]=[])}))}function y(e){return!!k()[c[e]]}function k(){return _.backlog}}(void 0,"globalEE"),c.ee=s)},3195:(e,t,r)=>{"use strict";r.d(t,{E:()=>n,p:()=>i});var n=r(2071).ee.get("handle");function i(e,t,r,i,o){o?(o.buffer([e],i),o.emit(e,t,r)):(n.buffer([e],i),n.emit(e,t,r))}},4539:(e,t,r)=>{"use strict";r.d(t,{X:()=>o});var n=r(3195);o.on=a;var i=o.handlers={};function o(e,t,r,o){a(o||n.E,i,e,t,r)}function a(e,t,r,i,o){o||(o="feature"),e||(e=n.E);var a=t[o]=t[o]||{};(a[r]=a[r]||[]).push([e,i])}},3585:(e,t,r)=>{"use strict";r.d(t,{bP:()=>c,iz:()=>s,m$:()=>a});var n=r(8438),i=!1;try{var o=Object.defineProperty({},"passive",{get:function(){i=!0}});n.ZP?.addEventListener("testPassive",null,o),n.ZP?.removeEventListener("testPassive",null,o)}catch(e){}function a(e){return i?{passive:!0,capture:!!e}:!!e}function c(e,t){let r=arguments.length>2&&void 0!==arguments[2]&&arguments[2];window.addEventListener(e,t,a(r))}function s(e,t){let r=arguments.length>2&&void 0!==arguments[2]&&arguments[2];document.addEventListener(e,t,a(r))}},2141:(e,t,r)=>{"use strict";r.d(t,{Rl:()=>i,ky:()=>o});var n=r(8438);function i(){var e=null,t=0,r=n.ZP?.crypto||n.ZP?.msCrypto;function i(){return e?15&e[t++]:16*Math.random()|0}r&&r.getRandomValues&&(e=r.getRandomValues(new Uint8Array(31)));for(var o,a="xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx",c="",s=0;s<a.length;s++)c+="x"===(o=a[s])?i().toString(16):"y"===o?(o=3&i()|8).toString(16):o;return c}function o(e){var t=null,r=0,n=self.crypto||self.msCrypto;n&&n.getRandomValues&&Uint8Array&&(t=n.getRandomValues(new Uint8Array(31)));for(var i=[],o=0;o<e;o++)i.push(a().toString(16));return i.join("");function a(){return t?15&t[r++]:16*Math.random()|0}}},9206:(e,t,r)=>{"use strict";r.d(t,{nb:()=>s,os:()=>u,yf:()=>c,zO:()=>a});var n=r(1209),i=(new Date).getTime(),o=i;function a(){return n.G&&performance.now?Math.round(performance.now()):(i=Math.max((new Date).getTime(),i))-o}function c(){return i}function s(e){o=e}function u(){return o}},1209:(e,t,r)=>{"use strict";r.d(t,{G:()=>n});const n=void 0!==r(8438).ZP?.performance?.timing?.navigationStart},745:(e,t,r)=>{"use strict";r.d(t,{s:()=>s,v:()=>u});var n=r(7036),i=r(1719),o=r(9206),a=r(1209),c=r(8438);let s=!0;function u(e){var t=function(){if(i.I&&i.I<9)return;if(a.G)return s=!1,c.ZP?.performance?.timing?.navigationStart}();t&&((0,n.B)(e,"starttime",t),(0,o.nb)(t))}},7036:(e,t,r)=>{"use strict";r.d(t,{B:()=>o,L:()=>a});var n=r(9206),i={};function o(e,t,r){void 0===r&&(r=(0,n.zO)()+(0,n.os)()),i[e]=i[e]||{},i[e][t]=r}function a(e,t,r,n){const o=e.sharedContext.agentIdentifier;var a=i[o]?.[r],c=i[o]?.[n];void 0!==a&&void 0!==c&&e.store("measures",t,{value:c-a})}},8547:(e,t,r)=>{"use strict";r.d(t,{T:()=>i});var n=r(8438);const i={isFileProtocol:function(){let e=Boolean("file:"===(0,n.lW)()?.location?.protocol);e&&(i.supportabilityMetricSent=!0);return e},supportabilityMetricSent:!1}},9011:(e,t,r)=>{"use strict";r.d(t,{K:()=>o});var n=r(5970);const i=["ajax","jserrors","metrics","page_action","page_view_event","page_view_timing","session_trace","spa"];function o(e){const t={};return i.forEach((r=>{t[r]=function(e,t){return!0!==(0,n.OP)(t).disabled&&!1!==(0,n.Mt)(t,`${e}.enabled`)}(r,e)})),t}},8025:(e,t,r)=>{"use strict";r.d(t,{W:()=>i});var n=r(2071);class i{constructor(e,t){let r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:[];this.agentIdentifier=e,this.aggregator=t,this.ee=n.ee.get(e),this.externalFeatures=r,this.blocked=!1}}},9010:(e,t,r)=>{"use strict";r.d(t,{X:()=>i});var n=Object.prototype.hasOwnProperty;function i(e,t,r){if(n.call(e,t))return e[t];var i=r();if(Object.defineProperty&&Object.keys)try{return Object.defineProperty(e,t,{value:i,writable:!0,enumerable:!1}),i}catch(e){}return e[t]=i,i}},8438:(e,t,r)=>{"use strict";r.d(t,{ZP:()=>a,il:()=>n,lW:()=>c,v6:()=>i});const n=Boolean("undefined"!=typeof window&&window.document),i=Boolean("undefined"!=typeof WorkerGlobalScope&&self.navigator instanceof WorkerNavigator);let o=(()=>{if(n)return window;if(i){if("undefined"!=typeof globalThis&&globalThis instanceof WorkerGlobalScope)return globalThis;if(self instanceof WorkerGlobalScope)return self}throw new Error("New Relic browser agent shutting down due to error: Unable to locate global scope. This is possibly due to code redefining browser global variables like `self` and `window`.")})();const a=o;function c(){return o}},9599:(e,t,r)=>{"use strict";r.d(t,{D:()=>i});var n=Object.prototype.hasOwnProperty;function i(e,t){var r=[],i="",o=0;for(i in e)n.call(e,i)&&(r[o]=t(i,e[i]),o+=1);return r}},248:(e,t,r)=>{"use strict";r.d(t,{$c:()=>s,Ng:()=>u,RR:()=>c});var n=r(5970),i=r(1925),o=r(8547),a={regex:/^file:\/\/(.*)/,replacement:"file://OBFUSCATED"};class c extends i.w{constructor(e){super(e)}shouldObfuscate(){return s(this.sharedContext.agentIdentifier).length>0}obfuscateString(e){if(!e||"string"!=typeof e)return e;for(var t=s(this.sharedContext.agentIdentifier),r=e,n=0;n<t.length;n++){var i=t[n].regex,o=t[n].replacement||"*";r=r.replace(i,o)}return r}}function s(e){var t=[],r=(0,n.Mt)(e,"obfuscate")||[];return t=t.concat(r),o.T.isFileProtocol()&&t.push(a),t}function u(e){for(var t=!1,r=!1,n=0;n<e.length;n++){"regex"in e[n]?"string"!=typeof e[n].regex&&e[n].regex.constructor!==RegExp&&(console&&console.warn&&console.warn('An obfuscation replacement rule contains a "regex" value with an invalid type (must be a string or RegExp)'),r=!0):(console&&console.warn&&console.warn('An obfuscation replacement rule was detected missing a "regex" value.'),r=!0);var i=e[n].replacement;i&&"string"!=typeof i&&(console&&console.warn&&console.warn('An obfuscation replacement rule contains a "replacement" value with an invalid type (must be a string)'),t=!0)}return!t&&!r}},4580:(e,t,r)=>{"use strict";r.d(t,{EZ:()=>u,Qy:()=>s,ce:()=>o,fP:()=>a,gG:()=>d,mF:()=>c});var n=r(9206),i=r(8438);const o={beacon:"bam.nr-data.net",errorBeacon:"bam.nr-data.net"};function a(){return i.ZP?.NREUM||(i.ZP.NREUM={}),void 0===i.ZP?.newrelic&&(i.ZP.newrelic=i.ZP.NREUM),i.ZP.NREUM}function c(){let e=a();if(!e.o){var t=self,r=t.XMLHttpRequest;e.o={ST:setTimeout,SI:t.setImmediate,CT:clearTimeout,XHR:r,REQ:t.Request,EV:t.Event,PR:t.Promise,MO:t.MutationObserver,FETCH:t.fetch}}return e}function s(e,t,r){let i=a();const o=i.initializedAgents||{},c=o[e]||{};return Object.keys(c).length||(c.initializedAt={ms:(0,n.zO)(),date:new Date}),i.initializedAgents={...o,[e]:{...c,[r]:t}},i}function u(e,t){a()[e]=t}function d(){return function(){let e=a();const t=e.info||{};e.info={beacon:o.beacon,errorBeacon:o.errorBeacon,...t}}(),function(){let e=a();const t=e.init||{};e.init={...t}}(),c(),function(){let e=a();const t=e.loader_config||{};e.loader_config={...t}}(),a()}},584:(e,t,r)=>{"use strict";r.d(t,{N:()=>i,e:()=>o});var n=r(3585);function i(e){let t=arguments.length>1&&void 0!==arguments[1]&&arguments[1];return void(0,n.iz)("visibilitychange",r);function r(){if(t){if("hidden"!=document.visibilityState)return;e()}e(document.visibilityState)}}function o(){return"hidden"===document.visibilityState?-1:1/0}},8539:e=>{e.exports=function(e,t,r){t||(t=0),void 0===r&&(r=e?e.length:0);for(var n=-1,i=r-t||0,o=Array(i<0?0:i);++n<i;)o[n]=e[t+n];return o}}},__webpack_module_cache__={},inProgress,dataWebpackPrefix;function __webpack_require__(e){var t=__webpack_module_cache__[e];if(void 0!==t)return t.exports;var r=__webpack_module_cache__[e]={exports:{}};return __webpack_modules__[e](r,r.exports,__webpack_require__),r.exports}__webpack_require__.m=__webpack_modules__,__webpack_require__.n=e=>{var t=e&&e.__esModule?()=>e.default:()=>e;return __webpack_require__.d(t,{a:t}),t},__webpack_require__.d=(e,t)=>{for(var r in t)__webpack_require__.o(t,r)&&!__webpack_require__.o(e,r)&&Object.defineProperty(e,r,{enumerable:!0,get:t[r]})},__webpack_require__.f={},__webpack_require__.e=e=>Promise.all(Object.keys(__webpack_require__.f).reduce(((t,r)=>(__webpack_require__.f[r](e,t),t)),[])),__webpack_require__.u=e=>e+"."+__webpack_require__.h().slice(0,8)+"-1222.js",__webpack_require__.h=()=>"95d4308d836c4fa71ea6",__webpack_require__.o=(e,t)=>Object.prototype.hasOwnProperty.call(e,t),inProgress={},dataWebpackPrefix="NRBA:",__webpack_require__.l=(e,t,r,n)=>{if(inProgress[e])inProgress[e].push(t);else{var i,o;if(void 0!==r)for(var a=document.getElementsByTagName("script"),c=0;c<a.length;c++){var s=a[c];if(s.getAttribute("src")==e||s.getAttribute("data-webpack")==dataWebpackPrefix+r){i=s;break}}i||(o=!0,(i=document.createElement("script")).charset="utf-8",i.timeout=120,__webpack_require__.nc&&i.setAttribute("nonce",__webpack_require__.nc),i.setAttribute("data-webpack",dataWebpackPrefix+r),i.src=e),inProgress[e]=[t];var u=(t,r)=>{i.onerror=i.onload=null,clearTimeout(d);var n=inProgress[e];if(delete inProgress[e],i.parentNode&&i.parentNode.removeChild(i),n&&n.forEach((e=>e(r))),t)return t(r)},d=setTimeout(u.bind(null,void 0,{type:"timeout",target:i}),12e4);i.onerror=u.bind(null,i.onerror),i.onload=u.bind(null,i.onload),o&&document.head.appendChild(i)}},__webpack_require__.r=e=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},__webpack_require__.p="https://web.archive.org/web/20230202013940/https://js-agent.newrelic.com/",(()=>{var e={783:0,519:0};__webpack_require__.f.j=(t,r)=>{var n=__webpack_require__.o(e,t)?e[t]:void 0;if(0!==n)if(n)r.push(n[2]);else{var i=new Promise(((r,i)=>n=e[t]=[r,i]));r.push(n[2]=i);var o=__webpack_require__.p+__webpack_require__.u(t),a=new Error;__webpack_require__.l(o,(r=>{if(__webpack_require__.o(e,t)&&(0!==(n=e[t])&&(e[t]=void 0),n)){var i=r&&("load"===r.type?"missing":r.type),o=r&&r.target&&r.target.src;a.message="Loading chunk "+t+" failed.\n("+i+": "+o+")",a.name="ChunkLoadError",a.type=i,a.request=o,n[1](a)}}),"chunk-"+t,t)}};var t=(t,r)=>{var n,i,[o,a,c]=r,s=0;if(o.some((t=>0!==e[t]))){for(n in a)__webpack_require__.o(a,n)&&(__webpack_require__.m[n]=a[n]);if(c)c(__webpack_require__)}for(t&&t(r);s<o.length;s++)i=o[s],__webpack_require__.o(e,i)&&e[i]&&e[i][0](),e[i]=0},r=window.webpackChunkNRBA=window.webpackChunkNRBA||[];r.forEach(t.bind(null,0)),r.push=t.bind(null,r.push.bind(r))})();var __webpack_exports__={};(()=>{"use strict";__webpack_require__.r(__webpack_exports__);var e=__webpack_require__(507),t=__webpack_require__(2687),r=__webpack_require__(3585);function n(e){if(!document||"complete"===document.readyState)return e()||!0}function i(e){n(e)||(0,r.bP)("load",e)}function o(e){n(e)||(0,r.iz)("DOMContentLoaded",e)}var a=__webpack_require__(8438),c=__webpack_require__(2071);let s=0;function u(e){(async()=>{if(!s++)try{const{aggregator:t}=await __webpack_require__.e(859).then(__webpack_require__.bind(__webpack_require__,7859));await t(e)}catch(e){console.error("Failed to successfully load all aggregators. Aborting...\n",e),c.ee.abort()}})()}var d=__webpack_require__(8539),l=__webpack_require__.n(d),f=__webpack_require__(4580),_=__webpack_require__(5970),p=__webpack_require__(3195),v=__webpack_require__(9599),b=__webpack_require__(9206);let g=!1;var h=__webpack_require__(7036),w=__webpack_require__(745),m=__webpack_require__(8025);class y extends m.W{constructor(e){super(e),a.il&&((0,w.v)(e),(0,h.B)(e,"firstbyte",(0,b.yf)()),i((()=>this.measureWindowLoaded())),o((()=>this.measureDomContentLoaded())))}measureWindowLoaded(){var e=(0,b.zO)();(0,h.B)(this.agentIdentifier,"onload",e+(0,b.os)()),(0,p.p)("timing",["load",e],void 0,void 0,this.ee)}measureDomContentLoaded(){(0,h.B)(this.agentIdentifier,"domContent",(0,b.zO)()+(0,b.os)())}}var k=__webpack_require__(584);class P extends m.W{constructor(e){var t;if(super(e),t=this,this.isEnabled()&&a.il){if(this.pageHiddenTime=(0,k.e)(),this.performanceObserver,this.lcpPerformanceObserver,this.clsPerformanceObserver,this.fiRecorded=!1,"PerformanceObserver"in window&&"function"==typeof window.PerformanceObserver){this.performanceObserver=new PerformanceObserver((function(){return t.perfObserver(...arguments)}));try{this.performanceObserver.observe({entryTypes:["paint"]})}catch(e){}this.lcpPerformanceObserver=new PerformanceObserver((function(){return t.lcpObserver(...arguments)}));try{this.lcpPerformanceObserver.observe({entryTypes:["largest-contentful-paint"]})}catch(e){}this.clsPerformanceObserver=new PerformanceObserver((function(){return t.clsObserver(...arguments)}));try{this.clsPerformanceObserver.observe({type:"layout-shift",buffered:!0})}catch(e){}}this.fiRecorded=!1;["click","keydown","mousedown","pointerdown","touchstart"].forEach((e=>{(0,r.iz)(e,(function(){return t.captureInteraction(...arguments)}))})),(0,k.N)((()=>{this.pageHiddenTime=(0,b.zO)(),(0,p.p)("docHidden",[this.pageHiddenTime],void 0,void 0,this.ee)}),!0),(0,r.bP)("pagehide",(()=>(0,p.p)("winPagehide",[(0,b.zO)()],void 0,void 0,this.ee)))}}isEnabled(){return!1!==(0,_.Mt)(this.agentIdentifier,"page_view_timing.enabled")}perfObserver(e,t){e.getEntries().forEach((e=>{"first-paint"===e.name?(0,p.p)("timing",["fp",Math.floor(e.startTime)],void 0,void 0,this.ee):"first-contentful-paint"===e.name&&(0,p.p)("timing",["fcp",Math.floor(e.startTime)],void 0,void 0,this.ee)}))}lcpObserver(e,t){var r=e.getEntries();if(r.length>0){var n=r[r.length-1];if(this.pageHiddenTime<n.startTime)return;var i=[n],o=this.addConnectionAttributes({});o&&i.push(o),(0,p.p)("lcp",i,void 0,void 0,this.ee)}}clsObserver(e){e.getEntries().forEach((e=>{e.hadRecentInput||(0,p.p)("cls",[e],void 0,void 0,this.ee)}))}addConnectionAttributes(e){var t=navigator.connection||navigator.mozConnection||navigator.webkitConnection;if(t)return t.type&&(e["net-type"]=t.type),t.effectiveType&&(e["net-etype"]=t.effectiveType),t.rtt&&(e["net-rtt"]=t.rtt),t.downlink&&(e["net-dlink"]=t.downlink),e}captureInteraction(e){if(e instanceof _.Yu.EV&&!this.fiRecorded){var t=Math.round(e.timeStamp),r={type:e.type};this.addConnectionAttributes(r),t<=(0,b.zO)()?r.fid=(0,b.zO)()-t:t>(0,b.os)()&&t<=Date.now()?(t-=(0,b.os)(),r.fid=(0,b.zO)()-t):t=(0,b.zO)(),this.fiRecorded=!0,(0,p.p)("timing",["fi",t,r],void 0,void 0,this.ee)}}}var x=__webpack_require__(4539),E="React",S="Angular",O="AngularJS",A="Backbone",q="Ember",C="Vue",T="Meteor",j="Zepto",I="Jquery";function R(){if(!a.il)return[];var e=[];try{(function(){try{if(window.React||window.ReactDOM||window.ReactRedux)return!0;if(document.querySelector("[data-reactroot], [data-reactid]"))return!0;for(var e=document.querySelectorAll("body > div"),t=0;t<e.length;t++)if(Object.keys(e[t]).indexOf("_reactRootContainer")>=0)return!0;return!1}catch(e){return!1}})()&&e.push(E),function(){try{return!!window.angular||(!!document.querySelector(".ng-binding, [ng-app], [data-ng-app], [ng-controller], [data-ng-controller], [ng-repeat], [data-ng-repeat]")||!!document.querySelector('script[src*="angular.js"], script[src*="angular.min.js"]'))}catch(e){return!1}}()&&e.push(O),function(){try{return!!(window.hasOwnProperty("ng")&&window.ng.hasOwnProperty("coreTokens")&&window.ng.coreTokens.hasOwnProperty("NgZone"))||!!document.querySelectorAll("[ng-version]").length}catch(e){return!1}}()&&e.push(S),window.Backbone&&e.push(A),window.Ember&&e.push(q),window.Vue&&e.push(C),window.Meteor&&e.push(T),window.Zepto&&e.push(j),window.jQuery&&e.push(I)}catch(e){}return e}var N=__webpack_require__(8547),M=__webpack_require__(248),Z=__webpack_require__(8873);const B=Boolean(a.ZP?.Worker),D=Boolean(a.ZP?.SharedWorker),W=Boolean(a.ZP?.navigator?.serviceWorker);let F,z,G;class L extends m.W{constructor(e){var t;let r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};super(e),t=this,this.PfFeatStatusEnum=r,this.singleChecks(),this.eachSessionChecks(),(0,x.X)("record-supportability",(function(){return t.recordSupportability(...arguments)}),void 0,this.ee),(0,x.X)("record-custom",(function(){return t.recordCustom(...arguments)}),void 0,this.ee)}recordSupportability(e,t){var r=["sm",e,{name:e},t];return(0,p.p)("storeMetric",r,null,void 0,this.ee),r}recordCustom(e,t){var r=["cm",e,{name:e},t];return(0,p.p)("storeEventMetrics",r,null,void 0,this.ee),r}singleChecks(){this.recordSupportability(`Generic/Version/${Z.q}/Detected`);const{loaderType:e}=(0,_.OP)(this.agentIdentifier);e&&this.recordSupportability(`Generic/LoaderType/${e}/Detected`),a.il&&o((()=>{R().forEach((e=>{this.recordSupportability("Framework/"+e+"/Detected")}))})),N.T.isFileProtocol()&&(this.recordSupportability("Generic/FileProtocol/Detected"),N.T.supportabilityMetricSent=!0);const t=(0,M.$c)(this.agentIdentifier);t.length>0&&this.recordSupportability("Generic/Obfuscate/Detected"),t.length>0&&!(0,M.Ng)(t)&&this.recordSupportability("Generic/Obfuscate/Invalid"),a.il&&this.reportPolyfillsNeeded(),function(e){if(!F){if(B){F=Worker;try{a.ZP.Worker=r(F,"Dedicated")}catch(e){o(e,"Dedicated")}if(D){z=SharedWorker;try{a.ZP.SharedWorker=r(z,"Shared")}catch(e){o(e,"Shared")}}else n("Shared");if(W){G=navigator.serviceWorker.register;try{a.ZP.navigator.serviceWorker.register=(t=G,function(){for(var e=arguments.length,r=new Array(e),n=0;n<e;n++)r[n]=arguments[n];return i("Service",r[1]?.type),t.apply(navigator.serviceWorker,r)})}catch(e){o(e,"Service")}}else n("Service");var t;return}n("All")}function r(e,t){return new Proxy(e,{construct:(e,r)=>(i(t,r[1]?.type),new e(...r))})}function n(t){a.v6||e(`Workers/${t}/Unavailable`)}function i(t,r){e("module"===r?`Workers/${t}/Module`:`Workers/${t}/Classic`)}function o(t,r){e(`Workers/${r}/SM/Unsupported`),console.warn(`NR Agent: Unable to capture ${r} workers.`,t)}}(this.recordSupportability.bind(this))}reportPolyfillsNeeded(){this.recordSupportability(`Generic/Polyfill/Promise/${this.PfFeatStatusEnum.PROMISE}`),this.recordSupportability(`Generic/Polyfill/ArrayIncludes/${this.PfFeatStatusEnum.ARRAY_INCLUDES}`),this.recordSupportability(`Generic/Polyfill/ObjectAssign/${this.PfFeatStatusEnum.OBJECT_ASSIGN}`),this.recordSupportability(`Generic/Polyfill/ObjectEntries/${this.PfFeatStatusEnum.OBJECT_ENTRIES}`)}eachSessionChecks(){a.il&&(0,r.bP)("pageshow",(e=>{e.persisted&&this.recordCustom("Custom/BFCache/PageRestored")}))}}var U=__webpack_require__(9011);const $=(0,e.n)(),H="lite";try{!function(e){if(g)return;const r=(0,f.gG)();a.v6&&(r.info.jsAttributes={...r.info.jsAttributes,isWorker:!0});try{(0,_.CX)(t.Z,r.info),(0,_.Dg)(t.Z,r.init),(0,_.GE)(t.Z,r.loader_config),(0,_.sU)(t.Z,{loaderType:e}),function(e){var t=(0,f.fP)(),r=c.ee.get(e),n=r.get("tracer"),i="api-",o=i+"ixn-";function a(){}(0,v.D)(["setErrorHandler","finished","addToTrace","inlineHit","addRelease"],(function(e,r){t[r]=u(i,r,!0,"api")})),t.addPageAction=u(i,"addPageAction",!0),t.setCurrentRouteName=u(i,"routeName",!0),t.setPageViewName=function(t,r){if("string"==typeof t)return"/"!==t.charAt(0)&&(t="/"+t),(0,_.OP)(e).customTransaction=(r||"https://web.archive.org/web/20230202013940/http://custom.transaction")+t,u(i,"setPageViewName",!0,"api")()},t.setCustomAttribute=function(t,r){const n=(0,_.C5)(e);return(0,_.CX)(e,{...n,jsAttributes:{...n.jsAttributes,[t]:r}}),u(i,"setCustomAttribute",!0,"api")()},t.interaction=function(){return(new a).get()};var s=a.prototype={createTracer:function(e,t){var i={},a=this,c="function"==typeof t;return(0,p.p)(o+"tracer",[(0,b.zO)(),e,i],a,void 0,r),function(){if(n.emit((c?"":"no-")+"fn-start",[(0,b.zO)(),a,c],i),c)try{return t.apply(this,arguments)}catch(e){throw n.emit("fn-err",[arguments,this,"string"==typeof e?new Error(e):e],i),e}finally{n.emit("fn-end",[(0,b.zO)()],i)}}}};function u(e,t,n,i){return function(){return(0,p.p)("record-supportability",["API/"+t+"/called"],void 0,void 0,r),(0,p.p)(e+t,[(0,b.zO)()].concat(l()(arguments)),n?null:this,i,r),n?void 0:this}}(0,v.D)("actionText,setName,setAttribute,save,ignore,onEnd,getContext,end,get".split(","),(function(e,t){s[t]=u(o,t)})),t.noticeError=function(e,t){"string"==typeof e&&(e=new Error(e)),(0,p.p)("record-supportability",["API/noticeError/called"],void 0,void 0,r),(0,p.p)("err",[e,(0,b.zO)(),!1,t],void 0,void 0,r)}}(t.Z),g=!0}catch(e){}}(H);const e=(0,U.K)(t.Z);e.page_view_event&&new y(t.Z),e.page_view_timing&&new P(t.Z),e.metrics&&new L(t.Z,$),function(e,t){let r=arguments.length>2&&void 0!==arguments[2]?arguments[2]:1e3;t?setTimeout((()=>u(e)),r):a.il?i((()=>u(e))):u(e)}(H)}catch(e){a.ZP?.newrelic?.ee?.abort&&a.ZP.newrelic.ee.abort()}})(),window.NRBA=__webpack_exports__})();</script> <noscript><style>form.antibot * :not(.antibot-message) { display: none !important; }</style> </noscript><script async src="https://web.archive.org/web/20230202013940js_/https://www.googletagmanager.com/gtag/js?id=UA-66610693-3"></script> <script>window.dataLayer = window.dataLayer || [];function gtag(){dataLayer.push(arguments)};gtag("js", new Date());gtag("set", "developer_id.dMDhkMT", true);gtag("config", "UA-66610693-3", {"groups":"default","anonymize_ip":true,"page_placeholder":"PLACEHOLDER_page_path","link_attribution":true,"allow_ad_personalization_signals":false,"custom_map":{"dimension2":"node_title","dimension3":"node_id","dimension7":"content_type"}});gtag("config", "G-HEQ0YF2VYL", {"groups":"default","page_placeholder":"PLACEHOLDER_page_location","link_attribution":true,"allow_ad_personalization_signals":false});gtag("config", "UA-33523145-1", {"groups":"default","anonymize_ip":true,"page_placeholder":"PLACEHOLDER_page_path","link_attribution":true,"allow_ad_personalization_signals":false,"custom_map":{"dimension2":"node_title","dimension3":"node_id","dimension7":"content_type"}});gtag("event", "custom", {"node_title":"Office of Weights and Measures","node_id":"411896","content_type":"Laboratory\/Organizational Unit"});</script> <link rel="canonical" href="https://web.archive.org/web/20230202013940/https://www.nist.gov/pml/owm"/> <link rel="shortlink" href="https://web.archive.org/web/20230202013940/https://www.nist.gov/node/411896"/> <meta name="description" content="The Office promotes uniformity, equity, and SI use and traceability in weights and measures by advancing national and international legal metrology standards, test procedures, capabilities, and training."/> <meta name="dcterms.title" content="Office of Weights and Measures"/> <meta name="dcterms.description" content="The Office promotes uniformity, equity, and SI use and traceability in weights and measures by advancing national and international legal metrology standards, test procedures, capabilities, and training."/> <meta name="dcterms.date" content="2009-07-27T09:48-04:00"/> <meta name="dcterms.type" content="text"/> <meta name="dcterms.format" content="text/html"/> <meta name="dcterms.identifier" content="https://www.nist.gov/pml/owm"/> <meta name="dcterms.source" content="NIST"/> <meta name="dcterms.created" content="2009-07-27T09:48-04:00"/> <meta name="dcterms.modified" content="2023-01-17T10:34-05:00"/> <meta name="citation_title" content="Office of Weights and Measures | NIST"/> <meta property="og:site_name" content="NIST"/> <meta property="og:type" content="Article"/> <meta property="og:url" content="https://web.archive.org/web/20230202013940/https://www.nist.gov/pml/owm"/> <meta property="og:title" content="Office of Weights and Measures"/> <meta property="og:description" content="The Office promotes uniformity, equity, and SI use and traceability in weights and measures by advancing national and international legal metrology standards, test procedures, capabilities, and training."/> <meta property="article:published_time" content="2009-07-27T09:48-04:00"/> <meta property="article:modified_time" content="2023-01-17T10:34-05:00"/> <meta name="google-site-verification" content="QMu0ODkER3rN5hLcMLqNVf7e3bkjYsNLTuhqfH48jCA"/> <meta name="twitter:card" content="summary_large_image"/> <meta name="twitter:site" content="NIST"/> <meta name="twitter:description" content="The Office promotes uniformity, equity, and SI use and traceability in weights and measures by advancing national and international legal metrology standards, test procedures, capabilities, and training."/> <meta name="twitter:title" content="Office of Weights and Measures"/> <meta name="twitter:url" content="https://web.archive.org/web/20230202013940im_/https://www.nist.gov/pml/owm"/> <meta name="Generator" content="Drupal 9 (https://www.drupal.org)"/> <meta name="MobileOptimized" content="width"/> <meta name="HandheldFriendly" content="true"/> <meta name="viewport" content="width=device-width, initial-scale=1.0"/> <meta name="nist_search_modified" class="elastic" content="2023-01-17T10:34:00-05:00"/> <script type="application/ld+json">{ "@context": "https://web.archive.org/web/20230202013940/https://schema.org", "@graph": [ { "@type": "Article", "headline": "Office of Weights and Measures | NIST", "description": "\u003Cp\u003EThe Office promotes uniformity, equity, and SI use and traceability in weights and measures by advancing national and international legal metrology standards, test procedures, capabilities, and training.\u003C/p\u003E", "image": { "@type": "ImageObject", "representativeOfPage": "True" }, "datePublished": "2009-07-27T09:48-04:00", "dateModified": "2023-01-17T10:34-05:00" } ] }</script> <meta name="nist_search_bundle" class="elastic" content="laboratory_organizational_unit"/> <link rel="icon" href="/web/20230202013940im_/https://www.nist.gov/themes/custom/nist_www/favicon.ico" type="image/vnd.microsoft.icon"/> <title>Office of Weights and Measures | NIST</title> <link rel="stylesheet" media="all" href="/web/20230202013940cs_/https://www.nist.gov/sites/default/files/css/css_F2gAVVlSdR3arDUpXp31o79SNgjcEodwd2bnXsnktzU.css"/> <link rel="stylesheet" media="screen" href="/web/20230202013940cs_/https://www.nist.gov/sites/default/files/css/css_gD8QmGaNfUQuThtjB-S0EwEOZZNJP1QfUU1bDdLHbMU.css"/> <link rel="stylesheet" media="print" href="/web/20230202013940cs_/https://www.nist.gov/sites/default/files/css/css_zbjDhj-AmeVwgu9y0DlPwEfp7l-a5BpoK3MpoGmRB6o.css"/> <link rel="stylesheet" media="all" href="/web/20230202013940cs_/https://www.nist.gov/sites/default/files/css/css_PV0KmreUx3hVeYI6yGypf71UDz9BSQl1Z5DjiESDh-Y.css"/> <link rel="stylesheet" media="screen" href="/web/20230202013940cs_/https://www.nist.gov/sites/default/files/css/css_e5DuZ68Yk6jKDRZI89Dctp-TrIyhXrRYettD_yNTSPA.css"/> <script src="/web/20230202013940js_/https://www.nist.gov/sites/default/files/js/js_VDwaIMNiRtzQn-NZvj1F9loIzJ-i4yEDiruzS8Z6Ejo.js"></script> </head> <body class="node-411896"> <a href="#main-content" class="visually-hidden focusable" data-elastic-exclude> Skip to main content </a> <div class="dialog-off-canvas-main-canvas" data-off-canvas-main-canvas>  <section data-elastic-exclude class="usa-banner" aria-label="Official government website"> <div class="usa-accordion"> <header class="usa-banner__header"> <div class="usa-banner__inner"> <div class="grid-col-auto"> <img class="usa-banner__header-flag" src="/web/20230202013940im_/https://www.nist.gov/libraries/nist-component-library/dist/img/us_flag_small.png" alt="U.S. flag"> </div> <div class="grid-col-fill tablet:grid-col-auto"> <p class="usa-banner__header-text">An official website of the United States government</p> <p class="usa-banner__header-action" aria-hidden="true">Here’s how you know</p> </div> <button class="usa-accordion__button usa-banner__button" aria-expanded="false" aria-controls="gov-banner-default"> <span class="usa-banner__button-text">Here’s how you know</span> </button> </div> </header> <div class="usa-banner__content usa-accordion__content" id="gov-banner-default"> <div class="grid-row grid-gap-lg"> <div class="usa-banner__guidance tablet:grid-col-6"> <img class="usa-banner__icon usa-media-block__img" src="/web/20230202013940im_/https://www.nist.gov/libraries/nist-component-library/dist/img/icon-dot-gov.svg" role="img" alt="" aria-hidden="true"> <div class="usa-media-block__body"> <p> <strong>Official websites use .gov</strong> <br/> A <strong>.gov</strong> website belongs to an official government organization in the United States. </p> </div> </div> <div class="usa-banner__guidance tablet:grid-col-6"> <img class="usa-banner__icon usa-media-block__img" src="/web/20230202013940im_/https://www.nist.gov/libraries/nist-component-library/dist/img/icon-https.svg" role="img" alt="" aria-hidden="true"> <div class="usa-media-block__body"> <p> <strong>Secure .gov websites use HTTPS</strong> <br/> A <strong>lock</strong> ( <span class="icon-lock"> <svg xmlns="http://www.w3.org/2000/svg" width="52" height="64" viewbox="0 0 52 64" class="usa-banner__lock-image" role="img" aria-labelledby="banner-lock-title banner-lock-description" focusable="false"> <title id="banner-lock-title">Lock</title> <desc id="banner-lock-description">A locked padlock</desc><path fill="#000000" fill-rule="evenodd" d="M26 0c10.493 0 19 8.507 19 19v9h3a4 4 0 0 1 4 4v28a4 4 0 0 1-4 4H4a4 4 0 0 1-4-4V32a4 4 0 0 1 4-4h3v-9C7 8.507 15.507 0 26 0zm0 8c-5.979 0-10.843 4.77-10.996 10.712L15 19v9h22v-9c0-6.075-4.925-11-11-11z"/></svg> </span> ) or <strong>https://</strong> means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. </p> </div> </div> </div> </div> </div> </section>  <div data-elastic-exclude>  <div class="nist-print-header" style="display:none;"> <p class="nist-print-header__url">https://www.nist.gov/pml/owm</p> <img class="nist-print-header__logo" width="289" height="38" src="/web/20230202013940im_/https://www.nist.gov/libraries/nist-component-library/dist/img/logo/nist_logo_sidestack.svg" alt="National Institute of Standards and Technology"/> </div> <div class="usa-overlay"></div> <header class="usa-header nist-header--www nist-header--minimal" role="banner"> <div class="usa-navbar"> <div class="usa-logo flex-fill"> <a href="/web/20230202013940/https://www.nist.gov/" title="National Institute of Standards and Technology" aria-label="Home"> <img src="/web/20230202013940im_/https://www.nist.gov/libraries/nist-component-library/dist/img/logo/logo.svg" alt="National Institute of Standards and Technology" width="300px" height="80px"/> </a> </div> <div class="usa-header__right grid-row flex-auto"> <div class="grid-col-fill nist-header__search-group"> <form class="usa-search usa-search--small" accept-charset="UTF-8" action="/web/20230202013940/https://www.nist.gov/search" id="search_form" method="get"> <div role="search"> <label class="usa-sr-only" for="search-form">Search NIST</label> <input class="usa-input" id="search-form" type="search" name="s" placeholder="Search NIST" required="" maxlength="128"> <button class="usa-button" type="submit"><img src="/web/20230202013940im_/https://www.nist.gov/libraries/nist-component-library/dist/img/usa-icons-bg/search--white.svg" class="usa-search__submit-icon" alt="Search"></button> </div> </form> </div> <div class="grid-col-auto padding-left-1"> <button class="usa-menu-btn">Menu</button> </div> </div> </div> <nav aria-label="Primary navigation" class="usa-nav"> <div class="usa-nav__inner"> <button class="usa-nav__close">Close</button> <ul class="usa-nav__primary usa-accordion"> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-1"><span>Topics</span></button> <div id="primary_menu-1" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/topics" class="usa-nav__link">All Topics</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/advanced-communications" class="usa-nav__link">Advanced communications</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/artificial-intelligence" class="usa-nav__link">Artificial intelligence</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/bioscience" class="usa-nav__link">Bioscience</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/buildings-construction" class="usa-nav__link">Buildings and construction</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/chemistry" class="usa-nav__link">Chemistry</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/climate" class="usa-nav__link">Climate</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/cybersecurity" class="usa-nav__link">Cybersecurity</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/electronics" class="usa-nav__link">Electronics</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/energy" class="usa-nav__link">Energy</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/environment" class="usa-nav__link">Environment</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/fire" class="usa-nav__link">Fire</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/forensic-science" class="usa-nav__link">Forensic science</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/health" class="usa-nav__link">Health</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/information-technology" class="usa-nav__link">Information technology</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/infrastructure" class="usa-nav__link">Infrastructure</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/manufacturing" class="usa-nav__link">Manufacturing</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/materials" class="usa-nav__link">Materials</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/mathematics-statistics" class="usa-nav__link">Mathematics and statistics</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/metrology" class="usa-nav__link">Metrology</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/nanotechnology" class="usa-nav__link">Nanotechnology</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/neutron-research" class="usa-nav__link">Neutron research</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/performance-excellence" class="usa-nav__link">Performance excellence</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/physics" class="usa-nav__link">Physics</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/public-safety" class="usa-nav__link">Public safety</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/resilience" class="usa-nav__link">Resilience</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/standards" class="usa-nav__link">Standards</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/transportation" class="usa-nav__link">Transportation</a> </li> </ul> </div> </div> </div> </li> <li class="usa-nav__primary-item"> <a class="usa-nav__link" href="/web/20230202013940/https://www.nist.gov/publications">Publications</a> </li> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-3"><span>Labs & Major Programs</span></button> <div id="primary_menu-3" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/labs-major-programs/laboratories" class="usa-nav__link">Laboratories</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230202013940/https://www.nist.gov/ctl" class="usa-nav__link">Communications Technology Laboratory</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/el" class="usa-nav__link">Engineering Laboratory</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/itl" class="usa-nav__link">Information Technology Laboratory</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/mml" class="usa-nav__link">Material Measurement Laboratory</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/pml" class="usa-nav__link">Physical Measurement Laboratory</a> </li> </ul> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/labs-major-programs/user-facilities" class="usa-nav__link">User Facilities</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230202013940/https://www.nist.gov/ncnr" class="usa-nav__link">NIST Center for Neutron Research</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/cnst" class="usa-nav__link">CNST NanoFab</a> </li> </ul> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/labs-major-programs/research-test-beds" class="usa-nav__link">Research Test Beds</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/laboratories/projects-programs" class="usa-nav__link">Research Projects</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/laboratories/tools-instruments" class="usa-nav__link">Tools & Instruments</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/labs-major-programs/major-programs" class="usa-nav__link">Major Programs</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230202013940/https://www.nist.gov/baldrige" class="usa-nav__link">Baldrige Performance Excellence Program</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/chips" class="usa-nav__link">CHIPS for America Initiative</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/mep" class="usa-nav__link">Manufacturing Extension Partnership (MEP)</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/oam" class="usa-nav__link">Office of Advanced Manufacturing</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/spo" class="usa-nav__link">Special Programs Office</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/tpo" class="usa-nav__link">Technology Partnerships Office</a> </li> </ul> </li> </ul> </div> </div> </div> </li> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link usa-current" aria-expanded="false" aria-controls="primary_menu-4"><span>Services & Resources</span></button> <div id="primary_menu-4" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/services-resources/standards-and-measurements" class="usa-nav__link usa-current">Standards and Measurements</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230202013940/https://www.nist.gov/calibrations" class="usa-nav__link">Calibration Services</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/nvlap" class="usa-nav__link">Laboratory Accreditation (NVLAP)</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/nist-quality-system" class="usa-nav__link">Quality System</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/srm" class="usa-nav__link">Standard Reference Materials (SRMs)</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/standardsgov" class="usa-nav__link">Standards.gov</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/pml/time-and-frequency-division/time-services" class="usa-nav__link">Time Services</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/pml/owm" class="usa-nav__link usa-current">Office of Weights and Measures</a> </li> </ul> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/services-resources/software" class="usa-nav__link">Software</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/data" class="usa-nav__link">Data</a> <ul class="usa-nav__submenu-list"> <li> <a href="https://web.archive.org/web/20230202013940/https://webbook.nist.gov/chemistry/" class="usa-nav__link">Chemistry WebBook</a> </li> <li> <a href="https://web.archive.org/web/20230202013940/https://nvd.nist.gov/" class="usa-nav__link">National Vulnerability Database</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/pml/productsservices/physical-reference-data" class="usa-nav__link">Physical Reference Data</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/srd" class="usa-nav__link">Standard Reference Data (SRD)</a> </li> </ul> </li> <li class="usa-nav__submenu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/shop" class="usa-nav__link">Storefront</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/tpo" class="usa-nav__link">License & Patents</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="https://web.archive.org/web/20230202013940/https://csrc.nist.gov/" class="usa-nav__link">Computer Security Resource Center (CSRC)</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/nist-research-library" class="usa-nav__link">NIST Research Library</a> </li> </ul> </div> </div> </div> </li> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-5"><span>News & Events</span></button> <div id="primary_menu-5" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news" class="usa-nav__link">News</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/news-events/events" class="usa-nav__link">Events</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/blogs" class="usa-nav__link">Blogs</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/feature-stories" class="usa-nav__link">Feature Stories</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/awards" class="usa-nav__link">Awards</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/video-gallery" class="usa-nav__link">Video Gallery</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/image-gallery" class="usa-nav__link">Image Gallery</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/director/pao/media-contacts" class="usa-nav__link">Media Contacts</a> </li> </ul> </div> </div> </div> </li> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-6"><span>About NIST</span></button> <div id="primary_menu-6" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/about-nist" class="usa-nav__link">About Us</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/about-nist/contact-us" class="usa-nav__link">Contact Us</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/about-nist/visit" class="usa-nav__link">Visit</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/careers" class="usa-nav__link">Careers</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/director/nist-organization-structure" class="usa-nav__link">Our Organization</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230202013940/https://www.nist.gov/director" class="usa-nav__link">Office of the Director</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/director/nist-organization-structure/budget-planning" class="usa-nav__link">Budget & Planning</a> </li> </ul> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/about-nist/work-nist" class="usa-nav__link">Work with NIST</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/history" class="usa-nav__link">History</a> <ul class="usa-nav__submenu-list"> <li> <a href="https://web.archive.org/web/20230202013940/http://nistdigitalarchives.contentdm.oclc.org/" class="usa-nav__link">NIST Digital Archives</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/nist-museum" class="usa-nav__link">NIST Museum</a> </li> <li> <a href="/web/20230202013940/https://www.nist.gov/nist-and-nobel" class="usa-nav__link">NIST and the Nobel</a> </li> </ul> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230202013940/https://www.nist.gov/education" class="usa-nav__link">Educational Resources</a> </li> </ul> </div> </div> </div> </li> </ul> </div> </nav> </header>  </div> <div class="grid-container"> <div data-drupal-messages-fallback class="hidden"></div> </div> <div id="block-nist-www-content" class="nist-block"> <section class="nist-page__content usa-section clearfix"> <a id="main-content" tabindex="-1"></a> <div class="nist-section-header nist-section-header--menu"> <div class="nist-section-header__top grid-container"> <a href="/web/20230202013940/https://www.nist.gov/pml">Physical Measurement Laboratory</a> </div> <div class="nist-section-header__sub"> <div class="nist-section-header__main grid-container"> <div class="grid-row"> <div class="nist-section-header__title tablet-lg:grid-col-4"> <h1 class="nist-page__title">Office of Weights and Measures</h1> </div> <div class="nist-section-header__desc tablet-lg:grid-col-8"> <div class="text-with-summary"> <p>The Office promotes uniformity, equity, and SI use and traceability in weights and measures by advancing national and international legal metrology standards, test procedures, capabilities, and training.</p> </div> </div> </div> </div> </div> </div> <div class="grid-container margin-top-4"> <div class="grid-row grid-gap-6"> <aside class="nist-page__region nist-page__region--sidebar-first tablet-lg:grid-col-4 desktop-lg:grid-col-3"> <div>  <div data-elastic-exclude="" class="nist-block"> <nav> <ul class="usa-sidenav usa-accordion "> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml" data-drupal-link-system-path="">Laboratory Homepage</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm" data-drupal-link-system-path="">Division Homepage</a> </li> <li class="usa-sidenav__item usa-sidenav__item--parent"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/programs" data-drupal-link-system-path="">Programs</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-3"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-3" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/international-legal-metrology" data-drupal-link-system-path="">International Legal Metrology</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-3-1"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-3-1" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/international-legal-metrology/documentary-standards" data-drupal-link-system-path="">Documentary Standards</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/international-legal-metrology/glossary-acronyms" data-drupal-link-system-path="">Glossary of Acronyms</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/international-legal-metrology/ilmp-organizational-primer" data-drupal-link-system-path="">ILMP Organizational Primer</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/international-legal-metrology/oiml-resources" data-drupal-link-system-path="">OIML Resources</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology" data-drupal-link-system-path="">Laboratory Metrology</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-3-2"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-3-2" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology/calibration-procedures" data-drupal-link-system-path="">Calibration Procedures</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology/standard-operating-procedures" data-drupal-link-system-path="">Standard Operating Procedures</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology/good-laboratory-practices" data-drupal-link-system-path="">Good Laboratory Practices</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology/good-measurement-practices" data-drupal-link-system-path="">Good Measurement Practices</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology/proficiency-testing" data-drupal-link-system-path="">Proficiency Testing</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology/state-lab-program-resources" data-drupal-link-system-path="">State Lab Program Resources</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology/lab-metrology-training" data-drupal-link-system-path="">Lab Metrology Training</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laws-and-regulations" data-drupal-link-system-path="">Laws and Regulations</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-3-3"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-3-3" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laws-and-regulations/fuels-and-lubricants-subcommittee" data-drupal-link-system-path="">Fuels and Lubricants Subcommittee</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laws-and-regulations/lr-resources" data-drupal-link-system-path="">L&R Resources</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laws-and-regulations/packaging-and-labeling" data-drupal-link-system-path="">Packaging and Labeling</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laws-and-regulations/precious-metals-conversion" data-drupal-link-system-path="">Precious Metals Conversion</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laws-and-regulations/price-verification" data-drupal-link-system-path="">Price Verification</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/laws-and-regulations/retail-and-unit-pricing-laws" data-drupal-link-system-path="">Retail and Unit Pricing Laws</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/legal-metrology-devices" data-drupal-link-system-path="">Legal Metrology Devices</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-3-4"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-3-4" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/legal-metrology-devices/hydrogen-us-national-work-group" data-drupal-link-system-path="">Hydrogen: U.S. National Work Group</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/legal-metrology-devices/taximeters-us-national-work-group" data-drupal-link-system-path="">Taximeters: U.S. National Work Group</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/legal-metrology-devices/electric-vehicle-fueling-and-submetering" data-drupal-link-system-path="">Electric Vehicle Fueling and Submetering</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230202013940/https://www.ncwm.com/ntep-about" data-drupal-link-system-path="">NTEP</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/legal-metrology-devices/training-materials" data-drupal-link-system-path="">Training Materials</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si" data-drupal-link-system-path="">Metric (SI)</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-3-5"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-3-5" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si/us-metrication" data-drupal-link-system-path="">U.S. Metrication</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si/si-units" data-drupal-link-system-path="">SI Units</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si/understanding-metric" data-drupal-link-system-path="">Understanding Metric</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si/everyday-metric" data-drupal-link-system-path="">Everyday with Metric</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si/si-education-training" data-drupal-link-system-path="">SI Education & Training</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si/unit-conversion" data-drupal-link-system-path="">Unit Conversion</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si/metric-policy" data-drupal-link-system-path="">Metric Policy</a> </li> </ul> </li> </ul> </li> <li class="usa-sidenav__item usa-sidenav__item--parent"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications" data-drupal-link-system-path="">Publications</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-4"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-4" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/measurement-matters-newsletter" data-drupal-link-system-path="">Measurement Matters Newsletter</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/nist-handbooks" data-drupal-link-system-path="">NIST Handbooks</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-4-2"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-4-2" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/nist-handbooks/handbook-44-current-edition" data-drupal-link-system-path="">Handbook 44 Current Edition</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/nist-handbooks/handbook-130-current-edition" data-drupal-link-system-path="">Handbook 130 Current Edition</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/weights-and-measures/publications/nist-handbooks/handbook-133-current-edition" data-drupal-link-system-path="">Handbook 133 Current Edition</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/nist-special-publications" data-drupal-link-system-path="">NIST Special Publications</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/internal-reports-nistir" data-drupal-link-system-path="">Internal Reports (NISTIR)</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/metric-publications" data-drupal-link-system-path="">Metric Publications</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/ncwm-annual-reports" data-drupal-link-system-path="">NCWM Annual Reports</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/publications/owm-technical-analysis" data-drupal-link-system-path="">OWM Technical Analysis</a> </li> </ul> </li> <li class="usa-sidenav__item usa-sidenav__item--parent"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/training" data-drupal-link-system-path="">Training</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-5"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-5" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/training" data-drupal-link-system-path="">Calendar of Events</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/training/resources-continuing-education-and-training" data-drupal-link-system-path="">Resources for Continuing Education and Training</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/us-national-working-groups" data-drupal-link-system-path="">U.S. National Working Groups</a> </li> <li class="usa-sidenav__item usa-sidenav__item--parent"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/resources" data-drupal-link-system-path="">Resources</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-7"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-7" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230202013940/https://tsapps.nist.gov/WMD/default.aspx" data-drupal-link-system-path="">OWM Contacts Systems</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-7-1"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-7-1" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/system/files/documents/pml/wmd/InstructionsHowToRequestResetPassword-web.pdf" data-drupal-link-system-path="">How to Reset Password Using the Contacts System (PDF)</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/system/files/documents/2016/09/07/Quick-Guide-for-Requesting-Training.pdf" data-drupal-link-system-path="">Quick Guide for OWM Contacts System (PDF)</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/system/files/documents/pml/wmd/InstructionsHowToRequestRequest-Pub.pdf" data-drupal-link-system-path="">How to Request Publications using OWM Contacts System (PDF)</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/system/files/documents/2016/09/07/InstructionsHowToRequestTrainingTranscripts.pdf" data-drupal-link-system-path="">How to Request Training & Transcript Using the Contacts System (PDF)</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/resources/nist-owm-security-and-privacy-policies" data-drupal-link-system-path="">NIST / OWM Security and Privacy Policies</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/resources/state-directors" data-drupal-link-system-path="">State Directors</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/resources/state-laboratories" data-drupal-link-system-path="">State Laboratories</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230202013940/https://www.ncwm.com/" data-drupal-link-system-path="">The National Conference on Weights and Measures (NCWM)</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/system/files/documents/2021/07/20/WMD-Directory-2021-July.pdf" data-drupal-link-system-path="">U.S. W&M and Metrologist Directory</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/resources/weights-and-measures-news" data-drupal-link-system-path="">Weights and Measures in the News</a> </li> </ul> </li> <li class="usa-sidenav__item usa-sidenav__item--parent"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/staff-and-technical-experts-directory" data-drupal-link-system-path="">Staff and Technical Experts Directory</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-office-of-weights-and-measu-8"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-office-of-weights-and-measu-8" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/staff-and-technical-experts-directory/federal-staff" data-drupal-link-system-path="">Federal Staff</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/staff-and-technical-experts-directory/associates-interns" data-drupal-link-system-path="">Associates & Interns</a> </li> </ul> </li> </ul> </nav> </div>   <div class="views-element-container nist-block nist-block--org" data-elastic-exclude=""> <h2 class="nist-block__title">Groups</h2> <div><div class="js-view-dom-id-f226c1a09e71b54295ad41c58ec56f76ae70d6c7455e776f5e9bcf8308eb3664"> <div class="link-list"> <ul> <li><div class="views-field views-field-title-1"><span class="field-content"><a href="/web/20230202013940/https://www.nist.gov/pml/owm/international-legal-metrology" hreflang="en">International Legal Metrology Program</a></span></div></li> <li><div class="views-field views-field-title-1"><span class="field-content"><a href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology" hreflang="en">Laboratory Metrology Program</a></span></div></li> <li><div class="views-field views-field-title-1"><span class="field-content"><a href="/web/20230202013940/https://www.nist.gov/pml/owm/laws-and-regulations" hreflang="en">Laws and Regulations Program</a></span></div></li> <li><div class="views-field views-field-title-1"><span class="field-content"><a href="/web/20230202013940/https://www.nist.gov/pml/owm/legal-metrology-devices" hreflang="en">Legal Metrology Devices Program</a></span></div></li> <li><div class="views-field views-field-title-1"><span class="field-content"><a href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si" hreflang="en">Metric Program</a></span></div></li> </ul> </div> </div> </div> </div>   <div data-elastic-exclude="" class="nist-block nist-social__wrapper--block"> <h2 class="nist-block__title">Connect with us</h2> <div><a href="https://web.archive.org/web/20230202013940/https://public.govdelivery.com/accounts/USNIST/subscriber/new?topic_id=USNIST_596" class="nist-social nist-social--envelope" title="GovDelivery"><span>GovDelivery</span></a></div> </div>  </div> </aside> <div class="nist-page__region nist-page__region--content tablet-lg:grid-col-8 desktop-lg:grid-col-9"> <div class="nist-block"> <div class="paragraph paragraph--type--hero paragraph--view-mode--default"> <div class="nist-hero grid-row grid-gap-2"> <div class="nist-hero__item tablet:grid-col-4 "> <div class="nist-hero__item-inner"> <div class="nist-hero__image"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/new-years-eve-2023-marked-retirement-us-survey-foot"> <picture> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/04/us-survey-foot-obsolete.webp?itok=LTs63iSf 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2023/01/04/us-survey-foot-obsolete.webp?itok=VupQwcof 2x" media="(min-width: 480px)" type="image/webp" width="600" height="360"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2023/01/04/us-survey-foot-obsolete.webp?itok=VizQ4GEQ 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/04/us-survey-foot-obsolete.webp?itok=LTs63iSf 2x" media="(min-width: 0px)" type="image/webp" width="300" height="180"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/04/us-survey-foot-obsolete.png?itok=LTs63iSf 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2023/01/04/us-survey-foot-obsolete.png?itok=VupQwcof 2x" media="(min-width: 480px)" type="image/png" width="600" height="360"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2023/01/04/us-survey-foot-obsolete.png?itok=VizQ4GEQ 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/04/us-survey-foot-obsolete.png?itok=LTs63iSf 2x" media="(min-width: 0px)" type="image/png" width="300" height="180"/> <img loading="eager" src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/04/us-survey-foot-obsolete.png?itok=LTs63iSf" width="600" height="360" alt="U.S. Survey Foot is obsolete" typeof="foaf:Image"/> </picture> </a> </div> <div class="nist-hero__caption"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/new-years-eve-2023-marked-retirement-us-survey-foot"> <div class="text">New Year’s Eve 2023 Marked the Retirement of the U.S. Survey Foot</div> </a> </div> </div> </div> <div class="nist-hero__item tablet:grid-col-4 "> <div class="nist-hero__item-inner"> <div class="nist-hero__image"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/evse-fast-charging-network-challenges-calibration-and-traceability"> <picture> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/06/EV%20chargers.webp?itok=gP9vJEaf 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2023/01/06/EV%20chargers.webp?itok=1Cv7N48- 2x" media="(min-width: 480px)" type="image/webp" width="600" height="360"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2023/01/06/EV%20chargers.webp?itok=6TC02fsw 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/06/EV%20chargers.webp?itok=gP9vJEaf 2x" media="(min-width: 0px)" type="image/webp" width="300" height="180"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/06/EV%20chargers.jpg?itok=gP9vJEaf 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2023/01/06/EV%20chargers.jpg?itok=1Cv7N48- 2x" media="(min-width: 480px)" type="image/jpeg" width="600" height="360"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2023/01/06/EV%20chargers.jpg?itok=6TC02fsw 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/06/EV%20chargers.jpg?itok=gP9vJEaf 2x" media="(min-width: 0px)" type="image/jpeg" width="300" height="180"/> <img loading="eager" src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/06/EV%20chargers.jpg?itok=gP9vJEaf" width="600" height="360" alt="EV chargers on the side of a road" typeof="foaf:Image"/> </picture> </a> </div> <div class="nist-hero__caption"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/evse-fast-charging-network-challenges-calibration-and-traceability"> <div class="text">EVSE Fast Charging Network: Challenges for Calibration and Traceability</div> </a> </div> </div> </div> <div class="nist-hero__item tablet:grid-col-4 "> <div class="nist-hero__item-inner"> <div class="nist-hero__image"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/weights-and-measures-week"> <picture> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/10/2023%20WMW.webp?itok=2kf15wZ6 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2023/01/10/2023%20WMW.webp?itok=1cK-7225 2x" media="(min-width: 480px)" type="image/webp" width="600" height="360"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2023/01/10/2023%20WMW.webp?itok=CciChvoB 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/10/2023%20WMW.webp?itok=2kf15wZ6 2x" media="(min-width: 0px)" type="image/webp" width="300" height="180"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/10/2023%20WMW.png?itok=2kf15wZ6 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2023/01/10/2023%20WMW.png?itok=1cK-7225 2x" media="(min-width: 480px)" type="image/png" width="600" height="360"/> <source srcset="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2023/01/10/2023%20WMW.png?itok=CciChvoB 1x, /web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/10/2023%20WMW.png?itok=2kf15wZ6 2x" media="(min-width: 0px)" type="image/png" width="300" height="180"/> <img loading="eager" src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2023/01/10/2023%20WMW.png?itok=2kf15wZ6" width="600" height="360" alt="2023 Weights and Measures Week Graphic" typeof="foaf:Image"/> </picture> </a> </div> <div class="nist-hero__caption"> <a href="/web/20230202013940/https://www.nist.gov/pml/owm/weights-and-measures-week"> <div class="text">Weights and Measures Week: March 1 to 7</div> </a> </div> </div> </div> </div> </div> <div class="nist-content-row nist-content-row--width-legible paragraph paragraph--type--text paragraph--view-mode--default"> <div class="nist-block text-long"><div class="OutlineElement Ltr SCXW216710491 BCX2"> <p class="paragraph">The NIST Office of Weights and Measures (OWM) provides documentary standards and services for legal metrology – <em>the practice and process of applying regulatory structure and laws enforcement to metrology</em>. This is directly aligned with our activities as the National Metrology Institute (NMI) for the U.S. to advance measurement science, standards, and technology and promote equitable standards worldwide, as well as our NIST mission to promote U.S. innovation and industrial competitiveness to enhance economic security.</p> <p class="paragraph">Nearly 50 percent of the U.S. Gross Domestic Product is impacted by the sales of products and services based on weights or measures. <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="d6b68bdc-cc73-4194-ad92-17f459f1618f" href="/web/20230202013940/https://www.nist.gov/pml/owm/staff-and-technical-experts-directory" title="OWM Staff and Technical Experts Directory">Our staff</a> works with a range of industry sectors -- such as the retail food sales, petroleum and chemical products, and transportation, including emerging commercial market sectors such as charging of electric vehicles and e-commerce. We promote <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="d897ce5e-ca33-4ca5-b462-08c0e65c928c" href="/web/20230202013940/https://www.nist.gov/pml/owm/metric-si" title="Metric Program">SI </a>use and traceability, promote and deliver <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="add127e0-ebf3-44c3-acfb-861a259ee2f5" href="/web/20230202013940/https://www.nist.gov/pml/owm/publications" title="OWM Publications and Documentary Standards">documentary standards</a>, develop technical guidance for <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="7db69429-69dc-4dea-9732-baedfbfd7d3a" href="/web/20230202013940/https://www.nist.gov/pml/owm/legal-metrology-publication-series-sp-2200" title="Legal Metrology Publication Series: SP 2200">legal metrology</a>, and provide training for <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="2fdf6250-2582-4211-831b-f29510b1d6f2" href="/web/20230202013940/https://www.nist.gov/pml/owm/laboratory-metrology" title="Laboratory Metrology Program">laboratory metrologists</a> and <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="f28337b2-3c56-4bce-990f-ba4e856170c5" href="/web/20230202013940/https://www.nist.gov/pml/owm/training" title="Weights and Measures Calendar of Events">weights and measures officials</a>.</p> <p class="paragraph"><a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="3c32ba8c-656e-4b59-824c-0fade928dccc" href="/web/20230202013940/https://www.nist.gov/pml/owm/programs" title="OWM Programs and Core Areas">OWM Programs</a> aim to ensure consumers get what they pay for, and sellers get fair payment for the goods and services they sell based on weight or measure through a uniform measurement infrastructure. This, in turn, promotes consumer confidence and helps ensure fair competition spanning local business operations to commerce on a global scale. Join OWM in celebrating <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="00093d56-1326-441d-8d96-c22b28e5217b" href="/web/20230202013940/https://www.nist.gov/pml/owm/weights-and-measures-week" title="Weights and Measures Week">Weights and Measures Week</a> from March 1 to 7.</p> <div class="nist-callout"> <p>Originally established in 1836 as the “Office of Construction of Standard Weights and Measures”, OWM also remains the oldest office at NIST. For more information, see <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="fa1e8786-3546-4cbb-8083-e3d8ca00a4d7" href="/web/20230202013940/https://www.nist.gov/pml/owm/brief-history-owm" title="A Brief History of OWM">A Brief History of OWM</a>.</p> </div> </div></div> </div> <div class="paragraph paragraph--type--dynamic-content-list-ou paragraph--view-mode--default"> <div class="nist-block "> <h2 class="nist-block__title"> <div class="string">News and Updates</div> </h2> <div class="viewsreference"><div class="views-element-container"><div class="js-view-dom-id-885d1305a6c4ebde7183c1e3e9bed2988fa81ed881f718346830da8dc556b28c"> <div> <article role="article" about="/news-events/news/2023/01/evse-fast-charging-network-challenges-calibration-and-traceability" typeof="schema:Article" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/evse-fast-charging-network-challenges-calibration-and-traceability" hreflang="en"><img src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/01/06/EV%20chargers.jpg?itok=uTD8J507" width="100" height="67" alt="EV chargers on the side of a road" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/evse-fast-charging-network-challenges-calibration-and-traceability"><span property="schema:name">EVSE Fast Charging Network: Challenges for Calibration and Traceability</span> </a></h3> <div class="nist-teaser__date"> <div class="daterange"><time datetime="2023-01-07T12:00:00Z">January 7, 2023</time> </div> </div> </header> <div class="nist-teaser__content"> <div property="schema:text" class="text-with-summary">The new year 2023 brings accelerated expansion of a nationwide network of electric vehicle supply equipment (EVSE), supported by the U.S. Department of Energy</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/news/2023/01/new-years-eve-2023-marked-retirement-us-survey-foot" typeof="schema:Article" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/new-years-eve-2023-marked-retirement-us-survey-foot" hreflang="en"><img src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/01/04/us-survey-foot-obsolete.png?itok=cuShJoNn" width="100" height="100" alt="U.S. Survey Foot is obsolete" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/new-years-eve-2023-marked-retirement-us-survey-foot"><span property="schema:name">New Year’s Eve 2023 Marked the Retirement of the U.S. Survey Foot</span> </a></h3> <div class="nist-teaser__date"> <div class="daterange"><time datetime="2023-01-06T12:00:00Z">January 6, 2023</time> </div> </div> </header> <div class="nist-teaser__content"> <div property="schema:text" class="text-with-summary">At the stroke of midnight on January 1, 2023, the U.S. survey foot was deemed obsolete and the international foot (i.e., 1 foot = 0.3048 meter exactly)</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/news/2023/01/nist-office-weights-and-measures-national-voluntary-laboratory" typeof="schema:Article" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/nist-office-weights-and-measures-national-voluntary-laboratory" hreflang="en"><img src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/01/06/NVLP%20Staff.jpg?itok=Q9zvClHW" width="100" height="100" alt="Kari Harper and Robert Knake" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/nist-office-weights-and-measures-national-voluntary-laboratory"><span property="schema:name">NIST Office of Weights and Measures – National Voluntary Laboratory Accreditation Program Partnership: New Faces and New Opportunities</span> </a></h3> <div class="nist-teaser__date"> <div class="daterange"><time datetime="2023-01-05T12:00:00Z">January 5, 2023</time> </div> </div> </header> <div class="nist-teaser__content"> <div property="schema:text" class="text-with-summary">The NIST Office of Weights and Measures (OWM) has long coordinated the accreditation of the State legal metrology laboratories through the OWM Recognition</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/news/2023/01/si-prefix-progress" typeof="schema:Article" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/si-prefix-progress" hreflang="en"><img src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/01/06/SI%20Brochure-Quote.png?itok=1HtXLKpK" width="100" height="51" alt=""The SI is not a static convention, but evolves following developments in the science of measurement" BIPM SI Brochure (9th Edition)" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/news-events/news/2023/01/si-prefix-progress"><span property="schema:name">SI Prefix Progress</span> </a></h3> <div class="nist-teaser__date"> <div class="daterange"><time datetime="2023-01-04T12:00:00Z">January 4, 2023</time> </div> </div> </header> <div class="nist-teaser__content"> <div property="schema:text" class="text-with-summary">In December 2022, the BIPM SI Brochure (9th Edition, December 2022, V2.01) was published to include the four new International System of Units (SI) prefixes</div> </div> </div> </article> </div> <footer> <div class="link-list"><a href="/web/20230202013940/https://www.nist.gov/news-events/news-updates/org/6436">View All News and Updates</a></div> </footer> </div> </div> </div> </div> </div> <div class="paragraph paragraph--type--dynamic-content-list-ou paragraph--view-mode--default"> <div class="nist-block "> <h2 class="nist-block__title"> <div class="string">Projects and Programs</div> </h2> <div class="viewsreference"><div class="views-element-container"><div class="js-view-dom-id-a9d542757e981e56bde03dbfb4d7214f9b1d353d3d524ce55730fe13e8e438a9"> <div> <article role="article" about="/programs-projects/electric-vehicle-supply-equipment-evse-test-instrumentation-guidance-documentation" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230202013940/https://www.nist.gov/programs-projects/electric-vehicle-supply-equipment-evse-test-instrumentation-guidance-documentation" hreflang="en"><img src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/01/06/EV%20chargers.jpg?itok=uTD8J507" width="100" height="67" alt="EV chargers on the side of a road" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/programs-projects/electric-vehicle-supply-equipment-evse-test-instrumentation-guidance-documentation"><span>Electric Vehicle Supply Equipment (EVSE) Test Instrumentation: Guidance Documentation</span> </a></h3> <div class="nist-teaser__type"> <div class="nist-badge display-inline-block margin-y-1 nist-badge--blue boolean">Ongoing</div> </div> </header> <div class="nist-teaser__content"> <div class="text-long"> The NIST Office of Weights and Measures (OWM) will begin work on developing a guideline document assessing methods for establishing traceability to primary SI </div> </div> </div> </article> </div> <footer> <div class="link-list"><a href="/web/20230202013940/https://www.nist.gov/laboratories/projects-programs/org/6436">View All Projects/Programs</a></div> </footer> </div> </div> </div> </div> </div> <div class="paragraph paragraph--type--dynamic-content-list-ou paragraph--view-mode--default"> <div class="nist-block "> <h2 class="nist-block__title"> <div class="string">Events</div> </h2> <div class="viewsreference"><div class="views-element-container"><div class="js-view-dom-id-4e4a51cee62ad5e408d714205911bfde5a82df4dfd80299bea188a628695cee3"> <div> <article role="article" about="/news-events/events/2023/01/5826-fundamentals-metrology" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/news-events/events/2023/01/5826-fundamentals-metrology"><span>5826 Fundamentals of Metrology</span> </a></h3> <div class="nist-teaser__date"> <div class="smartdate">Mon, Jan 30 - Fri, Feb 3 2023</div> </div> </header> <div class="nist-teaser__content"> <div class="text-with-summary">The 5-day Fundamentals of Metrology seminar is an intensive course that introduces participants to the concepts of</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/events/2023/02/5827-mass-metrology-seminar" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/news-events/events/2023/02/5827-mass-metrology-seminar"><span>5827 Mass Metrology Seminar</span> </a></h3> <div class="nist-teaser__date"> <div class="smartdate">Mon, Feb 6 - Fri, Feb 17 2023</div> </div> </header> <div class="nist-teaser__content"> <div class="text-with-summary">The Mass Metrology Seminar is a two-week, "hands-on" seminar. It incorporates approximately 30 percent lectures and 70</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/events/2023/02/5779-information-session-metric-system-education-resources" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/news-events/events/2023/02/5779-information-session-metric-system-education-resources"><span>5779 Information Session: Metric System Education Resources</span> </a></h3> <div class="nist-teaser__date"> <div class="smartdate">Thu, Feb 9 2023, 7:00 - 8:30pm EST</div> </div> </header> <div class="nist-teaser__content"> <div class="text-with-summary">The International System of Units (SI), commonly known as the metric system, is easy to use and learn when taught using</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/events/2023/02/5780-information-session-metric-system-estimation" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/news-events/events/2023/02/5780-information-session-metric-system-estimation"><span>5780 Information Session: Metric System Estimation</span> </a></h3> <div class="nist-teaser__date"> <div class="smartdate">Thu, Feb 23 2023, 7:00 - 8:30pm EST</div> </div> </header> <div class="nist-teaser__content"> <div class="text-with-summary">The International System of Units (SI), commonly known as the metric system, is easy to use and learn when taught using</div> </div> </div> </article> </div> <footer> <div class="link-list"><a href="/web/20230202013940/https://www.nist.gov/news-events/upcoming-events/org/6436">View All Events</a></div> </footer> </div> </div> </div> </div> </div> <div class="paragraph paragraph--type--dynamic-content-list-ou paragraph--view-mode--default"> <div class="nist-block "> <h2 class="nist-block__title"> <div class="string">Awards</div> </h2> <div class="viewsreference"><div class="views-element-container"><div class="js-view-dom-id-c1deb499a995861be12db0c37c0f69b5d2a5548f9f87599cf914f0936d5d7118"> <div> <article role="article" about="/awards/elizabeth-j-benham-recognized-ieee-standards-association" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230202013940/https://www.nist.gov/awards/elizabeth-j-benham-recognized-ieee-standards-association" hreflang="en"><img src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2021/04/07/Elizabeth%20Benham%202021-03.jpg?itok=7FfNmdfA" width="80" height="100" alt="Staff Photo Elizabeth Benham" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/awards/elizabeth-j-benham-recognized-ieee-standards-association"><span>Elizabeth J. Benham Recognized by the IEEE Standards Association</span> </a></h3> </header> <div class="nist-teaser__content"> <div class="text-long">The IEEE Standards Association is an organization focused on advancing global technologies through the Institute of Electrical and</div> </div> </div> </article> </div> <div> <article role="article" about="/awards/2021-usma-fellow-elizabeth-benham" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230202013940/https://www.nist.gov/awards/2021-usma-fellow-elizabeth-benham" hreflang="en"><img src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2021/04/07/Elizabeth%20Benham%202021-03.jpg?itok=7FfNmdfA" width="80" height="100" alt="Staff Photo Elizabeth Benham" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/awards/2021-usma-fellow-elizabeth-benham"><span>2021 USMA Fellow - Elizabeth Benham</span> </a></h3> </header> <div class="nist-teaser__content"> <div class="text-long">For going above and beyond in helping to advance U.S. Metric Association’s (USMA) goal of "completing the US conversion to the International</div> </div> </div> </article> </div> <div> <article role="article" about="/nist-awards/2020-bronze-medal-award-tina-gaver-butcher-lisa-warfield-juana-williams" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/nist-awards/2020-bronze-medal-award-tina-gaver-butcher-lisa-warfield-juana-williams"><span>2020 - Bronze Medal Award---Tina Gaver Butcher, Lisa Warfield, Juana Williams</span> </a></h3> </header> <div class="nist-teaser__content"> <div class="string-long">For leadership in developing uniform legal metrology requirements for electric vehicle charging and submetering adopted by the 50 states in 2019.</div> </div> </div> </article> </div> <div> <article role="article" about="/awards/2020-oiml-letter-appreciation-ralph-richter" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230202013940/https://www.nist.gov/awards/2020-oiml-letter-appreciation-ralph-richter" hreflang="en"><img src="/web/20230202013940im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/annual_award/bronze20-20richter20ralph000_0.jpg?itok=uF780QEd" width="100" height="75" alt="Richter" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230202013940/https://www.nist.gov/awards/2020-oiml-letter-appreciation-ralph-richter"><span>2020 OIML Letter of Appreciation – Ralph Richter</span> </a></h3> </header> <div class="nist-teaser__content"> <div class="text-long">This International Organization of Legal Metrology (OIML) Letter of Appreciation recognizes Ralph Richter for his outstanding contribution</div> </div> </div> </article> </div> <footer> <div class="link-list"><a href="/web/20230202013940/https://www.nist.gov/awards/org/6436">View All Awards</a></div> </footer> </div> </div> </div> </div> </div> </div> </div> </div> </div> <div class="grid-container"> <div class="nist-page__region nist-page__region--content-bottom"> <div class="nist-block nist-block--contact"> <h2 class="nist-block__title">Contacts</h2> <div class="nist-contact"> <h3 class="nist-contact__heading">General Inquiries:</h3> <ul class="nist-contact__items"> <li class="nist-contact__item"> <div class="nist-contact__name"> OWM </div> <div> <a href="https://web.archive.org/web/20230202013940/mailto:owm@nist.gov">owm@nist.gov</a> </div> <div> </div> </li> </ul> </div> <div class="nist-contact"> <h3 class="nist-contact__heading">Training Inquiries</h3> <ul class="nist-contact__items"> <li class="nist-contact__item"> <div class="nist-contact__name"> Yvonne Branden </div> <div> <a href="https://web.archive.org/web/20230202013940/mailto:yvonne.branden@nist.gov">yvonne.branden@nist.gov</a> </div> <div> </div> </li> </ul> </div> <div class="nist-contact"> <h3 class="nist-contact__heading">Website Inquiries:</h3> <ul class="nist-contact__items"> <li class="nist-contact__item"> <div class="nist-contact__name"> Yvonne Branden </div> <div> <a href="https://web.archive.org/web/20230202013940/mailto:yvonne.branden@nist.gov">yvonne.branden@nist.gov</a> </div> <div> </div> </li> </ul> </div> <div class="nist-contact"> <h3 class="nist-contact__heading">OWM Publications Inquiries</h3> <ul class="nist-contact__items"> <li role="article" about="/people/shelby-bowers" class="nist-contact__item"> <div class="nist-contact__name"><a href="/web/20230202013940/https://www.nist.gov/people/shelby-bowers" title="View staff profile page">Shelby Bowers</a></div> <div> <a href="https://web.archive.org/web/20230202013940/mailto:shelby.bowers@nist.gov">shelby.bowers@nist.gov</a> </div> </li> </ul> </div> </div> </div> </div> </section> </div> <div data-elastic-exclude>  <footer class="nist-footer padding-bottom-4"> <div class="grid-container nist-footer__info"> <div class="grid-row"> <div class="tablet:grid-col-6"> <div class="nist-footer__logo"> <a href="/web/20230202013940/https://www.nist.gov/" title="National Institute of Standards and Technology" rel="home"> <img class="nist-footer__logo-img" src="/web/20230202013940im_/https://www.nist.gov/libraries/nist-component-library/dist/img/logo/NIST-Logo-Brand-White.svg" alt="National Institute of Standards and Technology logo" width="300px" height="42px"/> </a> </div> <div class="nist-footer__contact"> <h3 class="nist-footer__contact-heading">HEADQUARTERS</h3> <address> 100 Bureau Drive<br> Gaithersburg, MD 20899<br> <a href="https://web.archive.org/web/20230202013940/tel:301-975-2000">301-975-2000</a> </address> <p> <a href="https://web.archive.org/web/20230202013940/mailto:do-webmaster@nist.gov">Webmaster</a> | <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/about-nist/contact-us">Contact Us</a> | <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/visit">Our Other Offices</a> </p> </div> </div> <div class="tablet:grid-col-6"> <div class="nist-footer__social-links"> <a class="nist-social nist-social--twitter-white" href="https://web.archive.org/web/20230202013940/https://twitter.com/NIST"> <span>Twitter</span> </a> <a class="nist-social nist-social--facebook-white" href="https://web.archive.org/web/20230202013940/https://www.facebook.com/NIST"> <span>Facebook</span> </a> <a class="nist-social nist-social--linkedin-white" href="https://web.archive.org/web/20230202013940/https://www.linkedin.com/company/nist"> <span>LinkedIn</span> </a> <a class="nist-social nist-social--instagram-white" href="https://web.archive.org/web/20230202013940/https://www.instagram.com/nist/"> <span>Instagram</span> </a> <a class="nist-social nist-social--youtube-white" href="https://web.archive.org/web/20230202013940/https://www.youtube.com/NIST"> <span>YouTube</span> </a> <a class="nist-social nist-social--giphy-white" href="https://web.archive.org/web/20230202013940/https://giphy.com/nist"> <span>Giphy</span> </a> <a class="nist-social nist-social--rss-white" href="https://web.archive.org/web/20230202013940/https://www.nist.gov/news-events/nist-rss-feeds"> <span>RSS Feed</span> </a> <a class="nist-social nist-social--envelope-white" href="https://web.archive.org/web/20230202013940/https://public.govdelivery.com/accounts/USNIST/subscriber/new"> <span>Mailing List</span> </a> </div> <div class="nist-footer__feedback"> How are we doing? <a class="usa-button" rel="nofollow" href="/web/20230202013940/https://www.nist.gov/form/nist-gov-feedback?destination=/pml/owm" title="Provide feedback">Feedback</a> </div> </div> </div> </div> <div class="grid-container"> <div class="nist-footer__nav" role="navigation"> <ul> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/privacy-policy">Site Privacy</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/oism/accessibility">Accessibility</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/privacy">Privacy Program</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/oism/copyrights">Copyrights</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.commerce.gov/vulnerability-disclosure-policy">Vulnerability Disclosure</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/no-fear-act-policy">No Fear Act Policy</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/office-director/freedom-information-act">FOIA</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/environmental-policy-statement">Environmental Policy</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/summary-report-scientific-integrity">Scientific Integrity</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.nist.gov/nist-information-quality-standards">Information Quality Standards</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://www.commerce.gov/">Commerce.gov</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/http://www.science.gov/">Science.gov</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/http://www.usa.gov/">USA.gov</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230202013940/https://vote.gov/">Vote.gov</a> </li> </ul> </div> </div> </footer>  </div> </div> <script type="application/json" data-drupal-selector="drupal-settings-json">{"path":{"baseUrl":"\/","scriptPath":null,"pathPrefix":"","currentPath":"node\/411896","currentPathIsAdmin":false,"isFront":false,"currentLanguage":"en"},"pluralDelimiter":"\u0003","suppressDeprecationErrors":true,"back_to_top":{"back_to_top_button_trigger":100,"back_to_top_prevent_on_mobile":false,"back_to_top_prevent_in_admin":true,"back_to_top_button_type":"image","back_to_top_button_text":"Back to top"},"google_analytics":{"account":"UA-66610693-3","trackOutbound":true,"trackMailto":true,"trackTel":true,"trackDownload":true,"trackDownloadExtensions":"7z|aac|arc|arj|asf|asx|avi|bin|bsh|c|csv|doc(x|m)?|dot(x|m)?|dw(fx|g|gd)|dxf|eps|epub|exe|f(90)|flv|gif|gz|gzip|hqx|jar|jpe?g|js|m1v|mp(2|3|4|e?g)|mobi|mov(ie)?|msi|msp|pdf|phps|pl|png|ppt(x|m)?|pot(x|m)?|pps(x|m)?|ppam|sld(x|m)?|thmx|qtm?|ra(m|r)?|rfa|rtf|rvt|sch|sea|sit|swf|tar|tgz|tif|txt|txz|wav|wma|wmv|wpd|wrl|xls(x|m|b)?|xlt(x|m)|xlam|xml|xsd|z|zip","trackDomainMode":1},"nist_search":{"clickTracking":"search-report-click","isDebug":false,"clickTrackEnabled":true,"message":"NIST Search in debug mode. Check the browsers network inspector for Click Track reporting results..."},"data":{"extlink":{"extTarget":false,"extTargetNoOverride":false,"extNofollow":false,"extNoreferrer":false,"extFollowNoOverride":false,"extClass":"ext","extLabel":"(link is external)","extImgClass":false,"extSubdomains":true,"extExclude":"\\.gov\\\/|\\.mil\\\/|\\manufacturingusa\\.com\\\/","extInclude":"","extCssExclude":"","extCssExplicit":"","extAlert":true,"extAlertText":"Thank you for visiting NIST. We hope your visit was informative. We have provided a link to this site because it has information that may be of interest to our users. NIST does not necessarily endorse the views expressed or the facts presented on this site. Further, NIST does not endorse any commercial products that may be advertised or available on this site. Click OK to be directed to your link.","mailtoClass":"0","mailtoLabel":"(link sends email)","extUseFontAwesome":false,"extIconPlacement":"append","extFaLinkClasses":"fa fa-external-link","extFaMailtoClasses":"fa fa-envelope-o","whitelistedDomains":[]}},"user":{"uid":0,"permissionsHash":"582eea317b4636ab5a0dffc8c6a006df3d6901ea5610498a0bbefc925ea1da0f"}}</script> <script src="/web/20230202013940js_/https://www.nist.gov/sites/default/files/js/js_AOg417qepduGFvXDI_SP863Nh3qVCuiSeO8_GAxUYnk.js"></script> <script src="https://web.archive.org/web/20230202013940js_/https://siteimproveanalytics.com/js/siteanalyze_6017546.js" async></script> <script src="/web/20230202013940js_/https://www.nist.gov/sites/default/files/js/js__m8lPoob6WYP5ISBblOsGOTOBGL48ZeEwQyTPAl7RqA.js"></script> <script type="text/javascript">window.NREUM||(NREUM={});NREUM.info={"beacon":"gov-bam.nr-data.net","licenseKey":"37b7ccb661","applicationID":"1089704227","transactionName":"YFxUN0sADEdYVkBaClkWdwBNCA1aFkVVVABoWlcAUQQ=","queueTime":0,"applicationTime":49,"atts":"TBtXQQMaH0k=","errorBeacon":"gov-bam.nr-data.net","agent":""}</script></body> </html>

CINXE.COM

Office of Weights and Measures | NIST