... chip, have fast measurement abil Digital Coating Thickness Gauge InstructionsDescriptions:AT220,AT230, AT240 these instruments use magnetic ... such as paint,a variety of anti-corrosion coating powders, plastic, rubber, synthetic materials, phosphide layer, chromium, zinc, ... as paint, powder, all kinds of anticorrosive coatings, plastic, rubber, synthetic materials, phosphating layer, oxidation layer AT ...