... and in harsh field conditions.The F probes measure the thickness of non-magnetic materials (e ... iron, nickel etc.). It is often used to measure the thickness of galvanizing layer, lacquer layer, ... alloy tile, paper etc.The N probes measure the thickness of non-magnetic coatings on non ... paint, enamel, plastic coatings, powder, etc. applied to aluminum, brass, non-magnetic stainless steel, etc.Automatic ...