... piece surface oxide layer automatically Experimental strength closed-loop control Hardness tester Feature & Use* Precise positioning device for workpiece which ... the process of clamping, milling, loading, unloading and hardness measuring of workpiece automatically.* Full automatic test force closed ... phase, 50HzWeight: Approx. 3500kg Model 210HR-150 Rockwell Hardness Tester, digital hardness tester