Voltage and current measurement: The male USB plug is plugged into a 5V charger, the female plug is inserted into the mobile phone and other equipment, and the voltage and current parameters are read directly. Measure the MicroUSB cable quality: plug in the mobile phone and other equipment, first plug in the 5V charger with the male plug, remember the voltage, then insert the 5V charger MicroUSB cable into the MicroUSB hole of the machine to memorize the voltage . , the voltage deviation is smaller The higher the quality of the MicroUSB cable.Measure the output capacity and efficiency of the mobile power supply: first connect the mobile power supply to the mobile phone, turn on the mobile power supply , press and hold the button until the capacity data returns to zero, insert the phone several times until the power is off automatically. The display capacity is the mAH of the mobile power output when the unit is next powered on. Note that this mAH is bea Changing data: click the button to switch to the next data set, then double click the button to switch to the previous data set. Clear data: hold the button for more than 3 seconds to clear group data.Features:Simultaneous display of voltage and current and mAH data for easy viewingCan detect mAH mobile power outputMultiple sets of test data are saved,power-off save functionDoes not affect the data transmissionHigher accuracy, current settings will not jump Male USB and MicroUSB ports are dual-powered to detect MicroUSB line quality25 milliohm current sampling, less lossWith accurate current calibration, current accuracy is higher (it has been calibrated at time of shipment) Performance Parameters: Input Voltage: 4V-30VVoltage resolution: 0.01VTest current: 0.3A Current resolution: 0.01A Capacity range: 0-19999mAH Accuracy: plus or minus 1% Line loss: about 0.1 ohm Test content: battery voltage, current, discharge capacity (10 sets of data in total) List: 1x digital voltage measuring instrumentNote: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the object physical received.