... accurate 5.maintaince 3 years Digital display rockwell hardness tester for metal Equipment discription:HZ-2522 HRMS-45-type digital ... surface Rockwell hardness tester, is a more advanced, using a large screen ... , zinc, chromium, tin material, bearing steel, chilled castings. Technical parameter:Hardneed surfaceHR15N, HR30N, HR45N, HR15T, HR30T, HR45TTest force15Kg (147 ...