How many "mesh" sieves do the samples pass through, what does "mesh" mean?
The purpose is a method of indicating the size of the mesh, and how many holes per inch of the screen is called "mesh". The larger the mesh size, the smaller the mesh size. There are different standards for mesh sizes in various countries, so the meaning of “mesh†is also different. Now the international standard sieve, basically using the Taylor sieve system, based on 200 mesh, the adjacent two sieves in the series have a mesh size difference of two, which is the difference of the mesh area. 
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