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