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, recall 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 mobile power: First connect the mobile power to the mobile phone, turn on the mobile power, designated the off button until the capacity data returns to zero, insert the phone several times until the power is turned 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. Erase Data: Through the button pressed for more than 3 seconds to erase band data. No need professional wiring, easy to operate, just plug in USB port, discharge and charger, you can monitor the device's working current and voltage, and count the battery capacity. 1. It can detect the charge capacity of tablet and mobile phone batteries, determine how much the battery performance has decreased and whether it needs to be restored. 2. It can detect the power bank's discharge capacity and calculate the power bank's conversion rate. 3. Can detect the charging current of your digital device. 4. the working current of 5V router and other 5V USB port devices (such as USBs), etc. Comes with USB input line, there is also a microusb port, you can use other lines for input. One end is connected to the power supply/mobile power supply, note that the default is to use the usb interface, that is, 5v; the other end is connected to the load, which can be a mobile phone. parameter: Input voltage: 3V-15V Voltage resolution: 0.01V Test current: 0.05A-3.50A Current resolution: 0.01A Capacity range: 0-19999mAH Accuracy: plus or minus 1% Line loss: about 0.1 ohms Test content: battery voltage, current , discharge capacity (10 data sets in total) White color Delivery quantity: 1 piece