The hardness can be determined steel, alloy steel, hard alloy, plating layer and carburizing, nitriding, the surface layer of cyanide Rockwell hardness. The measured hardness value can be read directly from the display window. Spindle system uses a frictionless spindle structure, initial test force exerted by the electromagnetic brake control, to improve the accuracy of the initial test force; total test force to impose, maintain, removable automated, eliminating manual brought error; hardness value can be fully automated digital display reading to avoid operator error; random printing device can print out the hardness measurement and data processing results.