| By Popularity | Alphabetical
Sites 1 - 3 of 3
- Physics Laboratory
Supports United States industry by providing measurement services and research for electronic, optical, and radiation technologies.
- Physical Reference Data
Includes physical constants, and other data on spectroscopy, ionizing radiation and dosimetry, nuclear and condensed matter physics, and more.
- Time and Frequency Division
Maintains the standard for frequency and time interval for the United States though the NIST-F1 Cesium Fountain Atomic Clock.