... (enamel,rubber,paints,plastics,copper,aluminum,zinc,tin,power,synthetic materials,Phosphide layer,Lead,tin,cadmium,ceramic oxide, Covering layer) on ... ,synthetic materials,anodic-oxide layer on copper,aluminum,zinc,tin,non-magnetic stainless steel,gold and silver. Cover layer ... insulation not conduct electricity.All coating thickness gauges are FN type double function !Product Feature: (1)It meets the ...