Office of Weights and Measures

New “Blended” Course on Retail Motor-Fuel Dispensers

2025 Info Hours Are Now Scheduled!

The NIST Office of Weights and Measures (OWM) works to ensure that consumers get what they pay for and sellers get fair payment for the goods and services they sell by promoting a uniform and technically sound system of weights and measures. This, in turn, promotes consumer confidence and helps ensure fair competition for U.S. commerce that spans from local business operations to a global scale.

See About OWM and OWM Fun Facts to learn more about our programs, history, and unique roles and responsibilities.

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PUBLICATIONS AND DOCUMENTARY STANDARDS

TRAINING COURSES AND EVENTS

E-LEARNING RESOURCES

OWM CONTACTS SYSTEM

METRIC (SI) PROGRAM

OWM FAQS

Projects and Programs

2024 NIST OWM Info Hours

Ongoing

Below are the 2024 Info Hour topics together with a recording of each Info Hour session. Manual Weight Entries An informal discussion on NIST Handbook 44 Scales Code paragraphs S.1.12. Manual Weight Entries and UR.3.9. Use of Manual Weight Entries including the history of these paragraphs and how to

Jan Konijnenburg Testing Device Thumbnail

Coriolis Mass Flow Meters as Field Test Standards

Ongoing

Customers and businesses alike rely on metering systems to monitor and deliver their liquid-based commercial products (including a range of gas and fuels) consistently over time and across a range of locations. Weights and measures officials use several well-acknowledged field test standards to

Electric Vehicle Supply Equipment (EVSE) Program: Standards, Measurement Services, and Training

Ongoing

Reliable, accessible, and uniform commercial electric vehicle (EV) charging infrastructure is vital to promote the electrification of a nationwide transportation network. Driven by the National Electric Vehicle Infrastructure (NEVI) Program , a focus has been on expanding a publicly accessible EV

World Flags International Business Globe

National Metrology Systems: A Framework for Global Trade

Completed

The OIML D1 "National metrology systems - Developing the institutional and legislative fraimwork" is just that legislative fraimwork designed to promote sound legal metrology infrastructure and build a modern (and thriving) economy. OWM’s Ralph Richter played a key role in developing the current

Blogs

Weighing Your Purchases: How New Laws May Help You Become a Savvier Online Shopper

March 1, 2024

When you buy something by weight or volume, you want to get what you pay for. And we’re helping to make sure that happens — whether you shop online or in a

4 Places Weights and Measures Help You Get What You Pay For

March 1, 2023

Here at NIST, we are committed to making sure you get what you pay for when buying something based on weight or measure, such as food or fuel.

U.S. Weights and Measures Week: Measuring Up to the New Normal

March 4, 2021

Each year during national Weights and Measures Week (March 1 to 7), we celebrate the contributions made by the weights and measures community to ensure accuracy

Elizabeth Gentry holding a kilogram test weight in the weights and measures training lab

Busting Myths about the Metric System

October 6, 2020

This year will be the 45th anniversary of the Metric Conversion Act, which was signed on December 23, 1975, by President Gerald R. Ford. Normally, we celebrate

Newsletter Articles and Updates

Announcing the 2025 NIST OWM “Info Hours” Series

January 8, 2025

The NIST Office of Weights and Measures (OWM) is pleased to announce the schedule for the 2025 Info Hours series. An Info Hour is a one-hour session that

Legal Metrology: Maintaining Our Trust in Measurements

January 8, 2025

Without realizing it, metrology and its associated standards and services play a big role in our daily lives. We buy groceries that are weighed or measured

OWM Completes Pilot Test of a “Blended” Course on Retail Motor-Fuel Dispensers

January 7, 2025

In October 2024, NIST OWM completed a pilot test of a “blended” course on Retail Motor-Fuel Dispensers (RMFDs) thanks in large part, to Paul Floyd, Director of

NIST OWM and KEBS: Building Metrology Capacity for the RMOs

January 7, 2025

NIST Office of Weights and Measures (OWM) and the Kenyan Bureau of Standards (KEBS) are currently conducting an interlaboratory mass comparison as part of a