GB/T 43432.2-2023 "Metallic materials—Barcol hardness test—Part 2: Verification and calibration of hardness testers" is applicable to Type A, Type B, and Type C Barcol hardness testers. It specifies two methods: direct verification and indirect verification. Direct verification includes the inspection of parameters such as the cone angle, tip diameter, and hardness of the indenter, as well as the calibration of the indicating device. Indirect verification evaluates the overall performance of the instrument through standard hardness blocks. The standard clearly defines the ambient temperature requirements for verification, specifies the evaluation criteria for indication error and repeatability, and stipulates the verification cycle and content of the verification report.