During the measurement, the colorimetric disc is put into the colorimetric device, and the colors of the left and right fields of view are compared for visual color comparison. Optional lighting system can provide constant observation conditions for chromaticity determination and improve the accuracy of measurement. The measurement method is to match the color of the sample with the chromaticity of a certain color slide on the color comparison plate by visual color comparison.

Using Comparator 2000 series colorimeters, in order to obtain accurate readings, it is recommended to use a constant Daylight 2000 daylight illumination system, especially when measuring light-colored samples. The use of this lighting system can ensure that a continuous and stable light source is provided for color matching, can be used continuously for 24 hours without interference from ambient light, and avoid the use of natural light that changes with time, temperature, and seasons