U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Physical Measurement Laboratory

Weights and Measures

To promote uniformity in national and international legal metrology laws, regulations, standards, test procedures, and enforcement practices so as to ensure traceability of measurements to the SI and to enhance consumer protection, foster fair competition, and facilitate economic growth and trade.

Office of Weights and Measurers

Office of Weights and Measures (OWM)

OWM fulfills its mission through the following broad activities:

  • Standards development (national and international)
  • Design and development of test and operational procedures
  • Design and delivery of training, in the areas of:
    • laboratory metrology,
    • weights and measures laws and regulations, and
    • weights and measures inspections;
  • Technical guidance
  • Implementation of national policy to establish the SI as the preferred system of weights and measures
  • Publications and outreach

Events

5615: Mass Metrology Seminar

Mon, Oct 19 - Fri, Oct 30 2020
The Mass Metrology Seminar is a two-week, "hands-on" seminar. It incorporates approximately 30 percent lectures and 70

Industry Impacts

A streaked image of a taxi and a dark car driving in Times Square, New York City street at night.

Fare Standards for Rideshare Services

To calculate fares, app-based ride services such as Lyft and Uber don’t use traditional taxi meters, but instead combine data from GPS and cellular networks to

Awards

Contacts

General Inquiries:

Training Inquiries

Website Inquiries: