Magnetic induction : Can measure the thickness of non-magnetic coating layers on magnetic substrate Eddy Current: Can measure the thickness of nonconductive coating layers coversd on nonferrous substrate,0.1 um (0-99.9um) 1 um (over 10Oum),0~1250 um/0~50mil,1.NON MAGNETIC MATERIALS(paint ,plastic,porcelain enamel,copper,zinc,aluminium,chrome..etc,ON MAGNETIC MATERIALS(IRON,NICKLE..ETC.)OFFER USED TO MEASURE THE THICKNESS OF GALVANIZING LAYER,PHOSPHIDELAYER,PORCELAIN ENAMEL LAYER, COPPER TILE,ALUMINIUMTILE,SOME ALLOY TILE,PAPER.ETC