It is used to measure the blue light whiteness of the surface of the object, the measurement result is digitally displayed, and the built-in printer is printed, which is easy to operate and high in accuracy. It is suitable for departments that need to measure the whiteness of products such as flour, starch, rice flour, salt, textiles, printing and dyeing, chemical fiber, plastics, porcelain clay, talcum powder, white cement, paint, paint, ceramics, enamel, paper, pulp, etc.