This International Standard reviews methods for measuring the thickness of metallic and other inorganic coatings on both metallic and non-metallic substrates (see Tables1, 2 and 3). It is limited to tests already specified, or to be specified, in International Standards, and excludes certain tests that are used for special applications. Table1 Methods of measuring coating thickness Non-destructive Destructive Split beam microscope (light section) ISO2128a Microscopical (optical) ISO1463 Magnetic ISO2178 Fizeau multiple-beam interferometry ISO3868b and ISO2361 Eddy current ISO2360 Profilometric (stylus) ISO4518b X-ray spectrometric ISO3497 Scanning electron microscope ISO9220 Beta backscatter ISO3543 Dissolution methods: Gravimetic strip and weigh method and gravimetric analytical method ISO10111 Coulometric method ISO2177 a Can be destructive in some applications. b Can be non-destructive in some applications.