Metal gloss meters are used to measure the gloss of various materials, such as automotive paint, stone, plastic, paper and other products, and are used in many industries. The selection of metal gloss instruments needs to refer to several precautions. The author lists the following according to his own experience:

Let's take a look at the principle of the metal gloss instrument: under the conditions of the specified light source and receiver opening angle, the ratio of the reflected light flux of the sample in the specular reflection direction to the reflected light flux of the glass standard sample in the specular reflection direction. Polished black glass with an index of refraction of 1.567 is given a specular gloss value of 100 (gloss units) at a geometric angle of 60 degrees. From the principle, we can see that the metal gloss instrument is a comparative test quantity that needs to be compared with the standard plate as a reference. If the standard plate is not accurate, other measurement data will not be discussed. The standard board is easily affected by scratches and dust. In the design of the instrument, it is necessary to consider that the standard board is well protected.

Secondly, the linearity of the measurement data of the Metal gloss meter, from the principle of the metal gloss instrument, we can infer that the linearity of the measurement data of the instrument is an important factor related to the quality of the instrument. If the gloss standard plate is accurate, for example, the gloss of the standard plate is 95.5, then the measurement data for materials with a glossiness around 95.5 is generally accurate, but for materials with a gloss far away from the standard plate, the measurement data is accurate, It is necessary to ensure that the linearity of the instrument measurement system is excellent. The linearity of the instrument to measure the acquisition system is a difficulty in the design of metal gloss instruments.