The ISO 2808-2019 standard details methods for measurement of coating film thickness for wet-film, Dry-Film and measurement of uncured powder layers. Written by ISO/TC 35/SC 9 Technical Committee, this standard covers a wide range of Measuring methods, including measurement of magnetic and nonmagnetic substrates. The updated 5th edition introduces new Measuring methods, such as White Light Interferometer and Terahertz technology, to meet the requirements of modern Measurement. In addition, the standard also describes in detail the scope of application of different test methods, accuracy and the use of standard references. The implementation of ISO 2808-2019 helps to ensure conformity and Reliability of coating mass, which is essential for production and quality control of coatings and related products.