GenRad / General Radio 1531-AB Stroboscope -IET Labs, Inc
Monarch Nova-Strobe DBL Kit LED Portable Stroboscope, with NIST Certificate of Calibration, 9" L x 3.66" W x 3.56" H, Includes Carrying Case: Rpm Strobe Light: Amazon.com: Industrial & Scientific
L-478DR-U-PX LiteMaster Pro for Phottix Strato II System Light Meter | Sekonic
NIST Traceable Calibrations and Light Sources - StellarNet, Inc.