We are offering digital portable metal hardness tester. Technical parameters :-accuracy +- 6 hlscales hrc, hrb, hb, hv, hsd, mpadisplay bright and clear lcd display with backlighttesting directions all directionprinter mini thermal printer with irda (cable no need)operating voltage 4.5v (3 aaa batteries)operating environment temperature : 0 +40?humidity : 20% 85%storage environment temperature : -30 +80?humidity : 5% 95%dimension 150mm*80mm*30mmweight approx.200gaccessories display unit, impact device d, test block, cleaning brush, printer cable