... the national standard GB/T230.2-2004. Rockwell Hardness Tester PHR Series small size, light weight, simple operation, easy ... production site, sales site and material storage. Rockwell Hardness Tester PHR Series can test from annealing, normalizing, tempering, quenching, quenching ... aluminum, carbide and other metal materials. Rockwell Hardness Tester PHR Series used to test the thickness of 2mm or more ...