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