Skip to main content
U.S. flag

An official website of the United States government

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

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.

Boulder

Candela

Vision is perhaps the most powerful of human senses, and light one of humanity’s age-old metaphors for understanding, wisdom and truth...

Meter

Whether it’s the interminable distance to Grandma’s house, a span of cloth, the number of yards to the goal line or the space between the...

PSIAP MCV Test Equipment

In November 2019, PSCR awarded three applicants the Public Safety Innovation Accelerator Program: Mission Critical Voice Test Equipment...

NIST USNO 2018 Archive

UTC (USNO) - UTC (NIST) The United States Naval Observatory (USNO) and the National Institute of Standards and Technology (NIST) make...

NIST UTC 2018 Archive

UTC - UTC (NIST) The deviation of UTC(NIST) from UTC has been less than +/-100 ns since July 6, 1994. The table below shows values of UTC...

Public Safety Communications Program

CTL advances public safety communication technology by researching, developing, and accelerating the adoption and implementation of critical communications
Was this page helpful?