Colorimeter

Colorimeter, device used to compare or measure colors and their intensities. A simple colorimeter uses an optical system to place an unknown color, such as of a chemical sample, next to a well-established color. In more advanced devices this comparison field can be adjusted in various quantifiable ways. In some, photoelectric cells may be used to measure the transmitted light. Colorimeters are used in chemical research and in various industries, such as the manufacture of dye and paint.