JITAI6100 Digital Car Paint Coating Thickness Gauge. It can measure the thickness of non-magnetic coating layers covered on magnetic substrate. Such as: non-magnetic (aluminum, chrome, copper, enamel, rubber, paint) covered on magnetic substrate (steel, alloy and magnetic stainless steel). It also can measure the thickness of non-conductive coatings layers covered on conductive substrate. Such as: (enamel, rubber paint, vanish, plastic anodic-oxide layer) covered on conductive substrate (aluminum, brass, zinc and nonmagnetic stainless steel). FE & NFE base – dual use. 5mm Concave radius: 25mm. Min thickness of substrate. Fe:0.4mm NFE:0.4mm. AA battery 2 pcs. Calibration piece + Zeroing plate.