... tin, cadmium and so on.AT-230(Plastic probe separated magnetic)AT-240(Metal probe separated type magnetic)AT-220F(wholeness vortex)Measuring all ... steel and some non-ferromagnetic matrix AT-23(Plastic probe separated type magnetic)AT-260(wholeness amphibious type)Measuring the thickness ... plastic, rubber, synthetic materials, phosphating layer, oxidation layer AT-280 Digital Coating Thickness Gauge