1.Adopts mechanical and manual testing method,without electrical device. 2.High precision,easily read ... , hardening and tempering steel, tempered steel, cold and hard casting parts, forging parts, hard alloy steel, aluminum alloy, bearing steel, carburized steel ... :Dial:Loading/Unloading handle:Objective Carrier:Accessories: MITECH HR-150A Manual Rockwell Hardness Tester