... coatings ( e.g. zinc, aluminum, Cr. Copper, rubber, paint and etc.) on magnetic metallic base ( such as steel, iron, alloy and ... coatings ( e.g. zinc, aluminum, Cr. Copper, rubber, paint and etc.) on magnetic metallic base ( such as steel, iron, alloy ... can measure the all electrically insulating coating layers thickness (such as lacquer,Varnish, paint,anodizing) coating on non-ferrous metals (such as ...