... Scale 1)with CE certification 2)stable in weight 3)battery:about 100 hours 4)RS232(optional) ... Weighing Scale Resolution1/30000ChargePower supply / rechargeable batteryCalibrationSingle point calibration and six points calibrationDisplayLCD with backlightUnitsKg,g, lb, oz, ... simple counting, check weighing, accmulation, print,Gross and net weight convertionOptional output1)Two sets of RS-232(unit ...