... e.g. paint, plastic, porcelain enamel, copper, zinc, aluminum , chrome etc.) on magnetic materials (e.g. iron, ... lacquer layer, porcelain enamel layer, phosphide layer, copper tile, aluminum tile, some alloy tile, paper etc. * The N probes measure the ... varnish, paint, enamel,plastic coatings, powder, etc. applied to aluminum, brass, non-magnetic,stainless ,steel, etc. * Automatic substrate ...