This set of 4 calibrated 2" diameter diffuse reflectance standards are used for establishment of photometric accuracy and linearity in diffuse reflectance. Reflectance calibration is NIST® traceable, and is calibrated 250-2500 nm reported each 50 nm. Disc is included with data each 1 nm. Reflectance factors are 99%, 75%, 50% and 2%.
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