ISO 4545-2:2017规定了根据ISO 4545-1测定金属材料努氏硬度的试验机的验证和校准方法。 规定了试验机、压头和对角线长度测量系统的直接验证和校准方法。为全面检查机器，规定了使用参考试块的间接验证方法。 如果试验机也用于其他硬度试验方法，则应针对每种方法单独进行验证。

ISO 4545-2:2017 specifies the method of verification and calibration of testing machines for determining Knoop hardness for metallic materials in accordance with ISO 4545？1. A direct method of verification and calibration is specified for the testing machine, indenter, and the diagonal length measuring system. An indirect verification method using reference blocks is specified for the overall checking of the machine. If a testing machine is also to be used for other methods of hardness testing, it will be verified independently for each method.