This standard specifies the structure, size parameters, accuracy requirements, inspection methods and marks, Encasement and other contents of the electronic digital display micrometer and the electronic digital display depth micrometer, which are suitable for precision measurement tools with electronic digital display function. The standard specifies the technical indicators and error allowable range of the digital display module and measurement mechanism, taking into account the precision and convenience of precision adjustment and depth measurement, providing a unified basis for product production, mass inspection and use, and ensuring the accuracy and conformity of relevant measurement results.