... coating thickness gaue for different customers' requirement. Measuring PrincipleThe instrument adopts the magnetic and eddy current principle to measure in a ... non-destructive way Magnetic way (type F probe)measure the thickness of nonmagnetic coatings on magnetic metallic base (e. ... g. zinc, aluminum, Cr. Copper, rubber, paint, coatingon the base of steel, iron, alloy and hard magnetic steel etc ...