1. Voltage and current measurement: plug 5V charger into the USB male, and plug mobile phone into the female seat to directly read the voltage and current parameters.

2. Measure the battery capacity: use TP4056 and other linear charging circuits to charge the completely dead battery to full through this capacity meter, and the capacity reading is the battery capacity. This method can also measure the mobile phone charging capacity, and even calculate the mobile phone charging efficiency.

3. Measure the output capacity and efficiency of the mobile power supply: first connect the mobile power supply to the mobile power supply, turn on the mobile power supply, press and hold the key until the capacity data is zero, insert the mobile phone for several times until the mobile power supply is powered off automatically. The next time the machine is turned on, the display capacity is the mAH of mobile power output. Note that this mAH is far smaller than the nominal mAH, output mAH * output voltage 5V/battery mAH * battery voltage 3.7V=mobile power efficiency.

4. Data reset: press the reset key for 3 seconds and the screen will display reset.

5. The explosion of rechargeable mobile phones is on the hot search list. Research analysis shows that when the mobile phone is charged, too high voltage or current input for a long time may lead to the explosion of mobile phone batteries. Let this product protect your safety.

Specifications:

Product name: KWS-V20

Size: 59mm (with USB73mm) * 23mm * 13.5mm

Input/output voltage: 3-9V

Voltage resolution: 0.01V

Input/output current: 0-3A

Current resolution: 0.01A

Accuracy: ± 1%

Line loss: about 0.1 Ω

Weight: 20g

Package includes:

1 * USB voltmeter

Note:

1. Due to manual measurement, please allow an error of 1-3 mm. Please confirm that you don't mind before ordering.

2. Please allow 1-3 g weight error. Please make sure you don't mind before ordering.

3. Due to the difference of light and display in the picture, the picture may not reflect the actual color of the object. Please make sure you don't mind before ordering, thank you!