Product Introduction Compared to other standard boards, diffuse reflection standard whiteboards have high stability and are suitable for a wide spectral range of ultraviolet visible near infrared (250-2500nm), with a reflectance ratio of up to 99%. The diffuse reflection standard whiteboards have diameters of 50mm, 38mm, and 27mm, and users can customize the size according to their needs. It is made of imported PTFE material processed at high temperature, which has waterproof function and will not lose powder or turn yellow over time. It is the most commonly used Lambertian reflector in the wavelength range of 250-2500nm. This diffuse reflectance standard whiteboard can be combined with a spectrometer and a light source to form a diffuse reflectance testing system, suitable for measuring the reflectance of various samples, such as silicon wafers, ceramics, frosted glass, plastics, etc.