... hardness. And it can swiftly convert the hardness value(Brinell HB, Luo s HRC, Vickers HV, Shaw HS). It can be ... -tin alloy (bronze), copper, forged steel.4. Hardness scale: HL, HB, HRB/C, HRA, HV, HS5.Display: dot matrix LCD,128 ... : 6V NI-MH; Battery charging power: 9V/500mA; Charging time: 2.5-3.5 hours10.Continuous working period: about 150 hours ...