Taking the Rockwell hardness value levels of 25.4HRC, 45.0HRC and 60.6HRC as examples to evaluate the uncertainty of the measurement results. The TH320 Rockwell hardness tester is used, and its measurement resolution is 0.1HRC. The verification of Rockwell Hardness Tester is carried out in accordance with JJG 112-1994. JJG 112-1994 stipulates that the indication error and indication repeatability of hardness testers are shown in Table 1 (omitted)