The ElektroPhysik 80-137-3900 MiniTest 735 Coating Thickness Gauge F15 HD, Ferrous Metals, 600 Mils / 15000 Microns (Heavy Duty) is the solution to all your coating thickness problems where a reliable finish and perfect product appearance play a major role for long-term value and success, e.g. in the automotive and shipbuilding industry, steel- and bridge construction or in the electroplating industry, to name a few industries.