There are two kinds of test sieves. One is Perforated plate sieves, and the other is woven wire test sieves.
The aperture size of Perforated plate sieves Is from 4mm to 125mm. The woven wire sizes from 38μm to 850μm(1-4.75 in mm). Two kinds of material we used, one is stainless steel, another is brass. Stainless steel or brass is generally used in the construction of woven wire mesh that performs the staining. These devices are very accurate, and are widely used in all types of laboratory particle analysis.