Light hitting a solid surface reflects in one of two ways. If the surface is smooth on a microscopic level, individual light rays will reflect at the same angle, if it is rough, the light will be scattered. Reflection from the smooth surface is called Specular Reflection, while reflection from the rough surface is called Diffuse Reflection. The sum is called the Total Reflection.   
   
The Diffuse Reflector is used to measure the diffuse reflectance of various samples such as Metal, Film, Glass, Cloth, Paper, Gems, Powder, etc. It can be also used for measuring the sample color using the LabPro® Plus software? Color Analysis mode.