The "GB/T 22520-2008 Film thickness indicator table" standard specifies in detail the terms and definitions, types and basic parameters, technical requirements, inspection methods, signs and Encasement of Film thickness indicator table. The standard applies to Film thickness indicator table with scale interval of 0.1 mm, 0.01 mm, 0.002 mm, 0.001 mm, and the upper limit of measurement range does not exceed 30 mm. The standard covers the design, function, performance requirements of Film thickness indicator table and environmental adaptability test methods, such as humidity cabinet test and temperature change test. It also includes electromagnetic compatibility test requirements of indication table to ensure the reliability and stability of equipment in actual use.