The JSA JIS H 8501 "Test Method for Thickness of Metallic Coatings" standard specifies the test method for thickness measurement of metallic coatings. The standard details several commonly used test techniques for metallic coatings, including magnetic method, eddy Current method, X-Rays fluorescence method, etc. These methods are suitable for different types of metallic coatings and are characterized by non-Destructiveness and high-precision. The standard also includes the operation steps of the test, instrument requirements, Measurement accuracy and related data processing methods to ensure the Reliability and conformity of the test results. The standard is widely used in coating mass control, product inspection and coating technology research, providing a scientific basis for the production and application of metallic coatings, especially in aviation, automotive, electronics and other industries.