A Brightness Tester is used to measure the brightness, yellowness, whiteness and chromatism of a cloth, paper, plastic, textile and dying, chemical, food, printing, salt or porcelain. It can also be used to measure the different colors of the material. The tester examines the transparency, coefficient, opacity, ink absorption, light scattering coefficient and light absorption coefficient. The Brightness Tester is also provided with a memory function, i.e. when the tester is closed for a long time, the information inside it is not lost and can be displayed next time when it is opened. The tester gives accurate results and allows easy handling, high resolution displays and compactness.