Specification:

• Detection voltage: DC2.5V ~ 30V
  
• Working current: <30mA
  
• Display: 0.28 inch LED
  
• Dimensions: 31 × 12.0 × 9mm (length x width x height)
  
• Installation hole: 23 × 10 mm
  
• Measurement rate: ≥200mS / times
  
• Accuracy: 1% (+/- 1 word)

Description:

This is a tiny and compact digital voltmeter with LED Display. 0.28inch 3.5-30V Two-Wire DC Voltmeter Blue Panel requires only a few minutes of configuration and is as simple as directly connecting wires to the source you want to measure and seeing the LED blink!!!!

This voltmeter doesn’t need external drive working power, it can work with measuring voltage, the working voltage’s range is 3.5-30V. To reach the best measurement accuracy, this voltmeter will automatically move the decimal point’s position according to the different measuring voltage. When it measures the voltage below 10V, it will display two places after the decimal point. When it measures the voltage above 10V, it will display one place after the decimal point.

how to use:

The red wire is to connect to the positive pole, the black wire is to connect to the negative pole. No need to worry even if there is any connection mismatch of the wires, the electric circuit won’t be a boom because it features reverse polarity protection.