... setting and working condition. The range of measuring Voltage110~280V,Power 1~3000W,Coulometer 0.0001~9999AH,Time: 0~60 ... minutes, 0~24 hours, 0~999 daysRefresh Frequency over two times per secondMeasurement Accuracy first classDisplay Mode 8 bit ... concern with time) LCD screen, plus 4 decimalsCompression of power frequency AC220v power supply,input /output time ≥AC2kV/min.1mAWorking Conditions ...