... test 2.DC12V power supply 3.Multimeter,power meter funciton 4.CE, FCC, ROHS certification CCTV ... and testing the Fiber Optic Patch Cord , etc.Digital MultimeterMulti-MeterVoltage, current, resistance and capacitance measuring, continuity ... hoursLow ConsumptionSleeping mode, display battery power stateOther ParametersWork Temperature-10°C---+50°CWork Humidity30%-90%Dimension/Weight112mmx189mmx47mm / ...