Dry film thickness (DFT) is the thickness of a coating as measured by using destructive and non-destructive methods. This includes measurement of single layer or multiple layers. DFT is measured for cured & dried coatings. A dry film thickness (DFT) gauge, often referred to as a coating thickness gauge.
For details refer ASTM D 1186-B, ASTM D 1400, ASTM D 7091, ASTM E 376, ASTM G 12, ISO 1461, ISO 19840, ISO 2063, ISO 2178, ISO 2360, ISO 2808-6A, ISO 2808-6B, ISO 2808-7C, ISO 2808-7D, ISO 2808-12, BS 3900-C5-6B, BS 3900-C5-6A, BS 5411-11, BS 5411-3, BS 5599, DIN 50981, DIN 50984, and SSPC PA 2