Equipped with a large LCD display, the operation interface features a menu-driven structure. Users can select the hardness scale (HV or HK) on the control panel, and the hardness values are automatically input and displayed. The system allows for various hardness value conversions, and test results can be automatically saved, processed, and printed. It is equipped with an RS-232 interface for computer connectivity. The machine is highly digital and automated. The hardness value error can be corrected through software input to meet the required accuracy.