... function of numbers on the screen2. Battery capacity display: divide into 3,2and1 grids. If battery capacity is too low, the instrument ... 0~450mm.6, Power, charging power supply: 220V/AC, Continuous operating time of battery,6~8 hours7, Stability, temperature drift: 0.2uV ... Allowable overload: 150%.12, Power supply mode: 5 nickel cyanogens battery /220V AC charge 4~6hour. Portable soil hardness meter