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.

Projects/Programs

Displaying 51 - 53 of 53

Traceability in Molecular Spectrophotometry

Ongoing
This program, sometimes referred to as the Optical Filters program, has supported the development, certification, and (as specified) recertification of Standard Reference Materials ® (SRMs ®) for the verification of the transmittance (absorbance) and wavelength scales of spectrophotometers in the

Water Measurement Science

Ongoing
Measurements and Standards for Contaminants in Water Accurate measurements of contaminants in water are critical to ensure the usability and safety of our water supplies. NIST has developed Standard Reference Materials (SRMs) for validating or calibrating methods for inorganic contaminants including
Was this page helpful?