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Instrument detection is detecting the reflected light amount on the layout, end milling and the amount of reflected light is converted to a water film thickness value. Observation method is simple, but the accuracy is poor a greater impact, by viewing angle, layout purpose sand thickness and extent of graphic layout the size and other factors, the inspection personnel experience, high technical requirements. Instead, the instrument detection accuracy is high, but the monitoring equipment is more expensive, there is very little in the adoption.