... 2.manual and automatic test 3.OEM/ODM hardness tester tool diamond hardness indenter YIYAN hardness indenter 'YIYAN' ... Widely used in measuring department's standard hardness tester, measuring materials have quenching, surface harden steel, steel, quenching and tempering, ... hardening thin plate, etc various materials.2. Because hardness tester model, structure, USES are not completely the same, so when ...