To help ensure stable quality of various light sources in terms of brightness and color, Model CS-150 with 1° measuring angle and Model CS-160 with smaller measuring angle of 1/3°, are capable of measuring chromaticity, luminance, and correlated color temperature values. Models LS-150 and LS-160, designed to measure luminance, are equipped with auto mode which automatically selects measurement speed best suited for luminance of object to be measured.