... as F-typeMagnetic inductionMeasure the thickness of Non-magnetic coating layers on magnetic substrate.Such as: (enamel,rubber,paints,plastics ... oxide, Covering layer) on steel,iron,alloy and hard-magnetic steel. Conductive or non-conductive coating layer is unimportant, ... currentMeasure the thickness of non-conductive coating layers on non-magnetic substrate.Such as: enamel,rubber, paint, plastic powder ...