Spectralon multi-step targets consist of four panels of 99, 50, 25 and 12% reflectance values mounted side-by-side. The four panels provide equal optical density differences and equal contrast between each adjacent panel. 10" square, purchased November 2019.
Calibration reflectance data: SRT-MS-100.txt
Care and handling: an-13012-000rev00.pdf
Calibration certificate: MS100-0919-2660.pdf