... speed DSP chip, have fast measurement abil Digital Coating Thickness Gauge InstructionsDescriptions:AT220,AT230, AT240 these instruments use magnetic ... coating powders, plastic, rubber, synthetic materials, phosphide layer, chromium, zinc, lead, tin, cadmium and so on.Measuring all non-conductive layer thickness ... materials, phosphating layer, oxidation layer AT-280 Digital Coating Thickness Gauge