We have four models coating thickness gaue for different customers' requirement. Measuring PrincipleThe instrument adopts ... non-destructive way Magnetic way (type F probe)measure the thickness of nonmagnetic coatings on magnetic metallic base (e.g. ... N probe)measure all electrically insulating coating layers,such as lacquer,Varnish, paint,anodizing coating onnonferrous metals,also on austenitic VA ...