... layers, chrome layers, tin layers, surface hardened treating and chemical treating materials, etc.XHR-150 Plastics Rockwell Hardness Tester adopts motorized testing ... :Hard plastics, hard rubbers, aluminum, tin, copper, soft steel, synthetic resins, fricative materials, etc.Technical Specifications TYPEPROJECTHR-150DTHRM-45DTXHR-150Rockwell ScalesHRA, HRB ...