1) Optical instrument 
A glossmeter (also gloss meter) is an instrument which is used to measure specular reflection gloss of a surface. Gloss is determined by projecting a beam of light at a fixed intensity and angle onto a surface and measuring the amount of reflected light at an equal but opposite angle. There are a number of different geometries available for gloss ...
instrument for measuring the various photometric properties of a surface giving rise to gloss
an instrument for measuring the reflectivity of a surface. Also called
An instrument used to measure the amount of gloss (a term used to describe the relative amount of mirror-like (specular) reflection from the surface of a sample). These instruments measure the light reflected at selected specular angles, such as 20 degrees from the perpendicular, 45, 60, 75, and 85 degrees. Results obtained are very dependent on in...