HRS-150 type digital Rockwell hardness tester using novel large-screen LCD display, the operator panel using the menu structure, its main function, a Rockwell hardness scale choice 2 choice of plastic Rockwell scale, 3 of hardness between the hardness conversion, hardness test results printout 4, 5 with automatic storage function and RS-232 HyperTerminal settings, the machine has good reliability, the work process more user-friendly, simple, direct digital display test results. Scope of hardened steel, quenched and tempered, annealed steel, chilled castings, malleable parts, carbide steel, aluminum, copper, bearing steel.