ISO 16859-2:2015规定了根据ISO 16859-1对用于测定里氏硬度的试验仪器进行直接和间接验证的方法，并描述了何时进行这两种验证。 直接验证包括检查单个仪器的性能参数是否在规定的范围内，而间接验证则利用参考试块的硬度测量值（根据ISO 16859？3进行校准），以检查仪器在重力方向上的整体性能。间接法可单独用于运行中的定期性能检查。

ISO 16859-2:2015 specifies methods for direct and indirect verification of test instruments used for determining Leeb hardness in accordance with ISO 16859？1, and also describes when these two types of verification are to be performed. The direct verification involves checking that individual instrument performance parameters fall within specified limits, whereas the indirect verification utilizes hardness measurements of reference test blocks, calibrated in accordance with ISO 16859？3, to check the overall performance of the instrument for testing in the direction of gravity. The indirect method can be used on its own for the periodic performance checking in service.