1.LCD display with back light Leebs 2.dness scale HL, HB, HRB, HRC, HRA, HV, ... Product Description Portable Leeb Hardness Tester RHL50Features LCD display of 128×64 matrix with back-light, showing all functions and parameters.Converts to ... , 4 years life timeContinuous Working time approx. 100 h (no back light off)Charging time 2-3.5 hOperating temperature 0~40 ...