Product Description: Quantity: one piece White Color Input Voltage: 3V-15V Voltage resolution: 0.01V Test current: 0.05A-3.50A Current resolution: 0.01 A Capacity range: 0-19999mAH Accuracy: plus or minus 1% Line loss: approx. 0.1 ohms Test content: battery voltage, current , discharge capacity (10 sets of data in total) 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 quality of the MicroUSB cable: plug in the mobile phone and other equipment, first plug in the 5V charger with the male plug, remember the voltage, then insert the MicroUSB cable of the 5V charger into the MicroUSB hole of the machine to memorize the voltage. , the voltage gap 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 phone mobile, turn on the mobile power, 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 Data change: click the button to switch to the next dataset, then double click the button to switch to the previous dataset. Clear Data: Press and hold the button for more than 3 seconds to clear group data.