The National Institute of Standards and Technology (NIST) recently completed major upgrades to two key instruments serving critical national needs: measuring the properties of light as it is reflected from a surface or transmitted through a material. The two instruments together are at the core of NIST’s ability to set and maintain the official U.S. scales for those measurements.
Click here for original story, Instruments used for official US scales for light measurements receive major upgrades
Source: Phys.org