We have four models coating thickness gaue for different customers' requirement. Measuring PrincipleThe instrument ... metallic base (e.g. zinc, aluminum, Cr. Copper, rubber, paint, coatingon the base of steel, iron, alloy and hard magnetic ... (type N probe)measure all electrically insulating coating layers,such as lacquer,Varnish, paint,anodizing coating onnonferrous metals,also on austenitic VA steel ...