Pen type design, easy operation, the unique large-screen OLED color display High repeat-ability, with replaceable battery compartment Measure the hardness scale HB, HRC, HRB, HV, HS, HL and strength Ï?b Compatible with D or DL impact device Display Type:1.77 inch OLED with resolution 160x128 pixels Hardness Scale:HL, HB, HRB, HRC, HV, HS, Strength (Ï?b) Measuring Range:HLD (200-960) HRC(19.8-68.5) HB(30-651) HV(80-976) HS(26.4-99.5) HRB(13.5-100)Ï?b (375-2639) Impact Device:D type impact device (Standard) Accuracy:Measuring Error:+ - 6HLD (HLD=800), Repeatability:+ -6HLD (HLD=800) Measuring Direction:360 degree Material:Steel& Cast Steel, Stainless Steel, GC IRON, NC IRON, Cast Aluminum alloy, Copper-zinc alloy, Copper-tin alloy, Brass, Forged Steel, Alloy Tool Steel Resolution:1HL, 1HV, 1HB, 0.1HRB, 0.1HRC, 0.1HS Calibration:Automatic Language:English, Chinese, Spanish, Japanese Data Memory:100groups (each group includes 1 TO 7 testing values and 1 average value) Power:10440 Polymer li-ion battery, Capacity of 600 MA/H,voltage:3.7 V, warning under low voltage Shut-off:Auto off after 3 minutes of inactivity