The ISO DIS 2100-508 standard specifies the touchpoint Coating thickness Measuring method for aerospace optoelectronic connectors. The standard is suitable for the quality control and testing of optoelectronic connectors in the aerospace field, especially for the thickness measurement of touchpoint surface coatings. The thickness of touchpoint coatings is crucial for the performance and Reliability of connecting components. Therefore, by accurately measuring methods, the Coating thickness meets the design requirements, which can effectively improve the long-term durability and electrical performance of connecting components. This standard provides a reliable measurement means for the aerospace industry to support product development, production and mass management.