... testing method.automatically loaded and unloaded testing force. 2)Avoid man-made error and easy operation. HR-150DT Motorized Superficial Rockwell ... force can be loaded, kept and unloaded automatically. Avoid man-made error and easy to use. It is therefore, welcomed ... force can be loaded, kept and unloaded automatically. Avoid man-made error and easy to use. The characteristics of the instrument ...