Simultaneous display of voltage and current data for easy viewing. Can detect multiple power supply output voltages and currents. Can easily measure the operating current of the output voltage of the USB port and equipment. With precision current calibration, current accuracy is higher (it has been calibrated at the time of shipment). Small size, no power and other ancillary equipment, plug and play, suitable for factories, laboratory users. Specifications: Input / output voltage 3V-9V Voltage resolution: 0.01V Input / output current: 0A-5A (see the range of use 0-3A) Current resolution: 0.01A Accuracy: plus or minus 1% Line loss: about 0.1 ohm Test content: voltage, current, Communication function: Yes Data calibration function: Yes