3-Digits LED Digital Voltmeter

Description

Only two wires needs to be connected, the red wire is connected to the positive, and the black wire is connected to the negative.
Reverse connection protection. Wont burn if polarity is reversed.
No external working power supply, it works directly with the measured voltage, and the working voltage range is as wide as 4.5-30V.
In order to achieve the best measurement accuracy, the voltmeter will automatically move the position of the decimal point according to the difference of the measured voltage. Measuring voltage below 10V
At the time, two digits are displayed after the decimal point; when measuring a voltage above 10V, one digit is displayed after the decimal point.
Can be used to monitor the battery voltage of motorcycles, automobiles, etc., and grasp the battery status in time. It can also be used for other voltage measurement purposes.