What should we pay attention to when selecting the test force for a microhardness tester?

When selecting the test force for a microhardness tester, we need to make a selection based on the material and properties of the sample. Different materials require different test forces to obtain accurate hardness values. At the same time, we also need to pay attention to the unit of test force to ensure that the selected test force matches the requirements of the hardness tester. In Chung-Tse's microhardness tester, the selection of test force is very simple, requiring only the rotation of the test force change handwheel.