The hardness of Rockwell hardness test for the set of machines, Rockwell hardness tester, plastic hardness tester Rockwell Hardness Tester multifunctional by Rockwell (ROCKWELL) measurement principle, can be directly measured Rockwell hardness, Rockwell superficial Hardness Measurement, plastic Rockwell hardness measurement, and can be converted to Rockwell hardness HB, HV, HLD, 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. Can be widely used in measuring, machinery, metallurgy, chemical industry, building materials industry testing, research and production.