Product Features; Six Impact Devices are available for special applications(D,DC,D+15,C,DL,G) Direct display of hardness scales HRB,HRC,HV,HB,HS,HL; Software to connect with PC and Dataview for PC operation; Automatic identification Impact Devices and test direction (Except G); Software data and upperlower limits setting and sound alarm; Time and date setting; auto-clock; On-Board memory holds 240-1000 groups of data; Integral thermal printer, print all test results and histogram; For all metallic materials; Li Battery , low voltage indication and sound alarm; LCD with blue back-light, showing all functions and parameters; Wide measuring range; Long standby time and stable performance of field work; Technical specifications: Hardness Scale:HL,HRC,HRB,HV,HB,HS Accuracy:í+4HLD(760í+20HLD) repeatability of displayed value Standard Impact Device:D limits set measuring range:(170~960)HLDD Optional Impact Devices:C DC D+15 DL G Operating Temperaturee:0~40 Statistics Function:Average Max Min calculation,limits setting and alarm Testing direction:Automatic Min.thickness of hardened:0.8mm Chargeing time:3~5hours Power:Li Battery 4.2V/1600mAh Charger:5V/500mA Overall Dimensions:147*69*23mm Weight:186g Computer Interface:RS232 Min.Workpiece thickness:5mm (D DC DL D+15)1mm (C)10mm (G) memory:240~1000 groups Min.Workipece Weight:2~5Kg on stable support 0.05~2Kg with compact coupling Min.Radius of Workpiece:Rmin=50mm(with support ring Rmin=10mm) Max.Workpiece Hardnesss:996HV (D DC D+15 DL C) 646HB (G) Continuous Working Time:About 200hours