GB/T 21838.2-2022 stipulates the inspection and calibration method of the testing machine in the instrumented indentation test of metal materials. The standard specifies the inspection calibrating items, covering the accuracy of the force value of the testing machine, the displacement Measurement accuracy, the accuracy of the loading rate, etc. Strict requirements are put forward for the accuracy of the equipment such as standard blocks and measuring tools for calibrating, and the operation process is explained in detail, including the equipment Appearance inspection, testing under different loads and displacement conditions. Through the implementation of the specification, the performance of the testing machine is stable and reliable, which is a solid foundation for the accurate determination of metal hardness of materials and related parameters, and strongly supports the research and development and mass inspection of metal materials.