Rockwell hardness tester using surface (ROCKWELL) measurement principle, can be directly measured surface Rockwell hardness and Rockwell superficial hardness can convert the value of HB, HV, HK, σb value. For carbon steel, alloy steel, cast iron, nonferrous metals and engineering plastics and other materials, hardness testing, with high precision, wide measuring range, the main force of automatic loading and unloading test, measurement and automatically print or digital display and an external computer communication characteristics. Superficial Rockwell test Rockwell test is to test the direction of extension of the force is small, and therefore particularly suitable for ordinary Rockwell hardness test can not be measured in small, small, thin samples were measured.