Why is the accuracy of a microhardness tester higher than that of other hardness testing methods?

The reason why the microhardness tester has higher precision is that it adopts a square pyramidal diamond indenter. Under the action of the test force, the indenter is pressed into the sample surface and held for a specified time, and then the test force is unloaded. The indentation appears as a clear square, allowing the diagonal length to be accurately measured. This precise measurement method ensures that the test results of the microhardness tester have a high degree of accuracy and repeatability; compared with other hardness testing methods, the microhardness tester has higher precision.