Direction angle mark: the circle of the polarizing plate has obvious direction and scale mark, and the scale and the figure are clear. Product is made up of partial film, seized the polarizer?Disc diameter is not less than 170mm, the effective diameter of polarizer and seized the polarizer is not less than 120 mm.Angle indicator, minimum angle of 1 degrees, 90 degrees for a large lattice, 5 degrees for a small lattice.
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