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Three wire 0.28 Inch LED Mini DC Voltmeter

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Price Price=220
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This is a mini DC voltmeter with LED display. Thanks to the small dimension it can be easily integrated into your project. It has three wires (yellow, red and black) and can measure up to 100V.  The voltmeter can measure up to 100V. If the actual measured voltage is higher than 3.5V and is lower than 30V, you can also merge the red and yellow wires and simplify the wiring like this. In this case, the measured voltage will also work as the power supply for the voltmeter. This voltmeter has been calibrated before leaving the factory. However, if you want to get better accuracy,  you can calibrate it by spinning the potentiometer on its back. Spinning the potentiometer clock-wise will reduce the displayed voltage value.


  1. Power Supply:   3.5~30V
  2. Measured Voltage:   0~100V (3-wire mode) or 0~30V (2-wire mode)
  3. Working Temperature:  -10~+65℃
  4. Measure Speed:  200ms a time
  5. Accuracy:  3%

Usage Guide:

  1. This voltmeter has three wires, and they are:
  2. Yellow: anode of the measured voltage
  3. Red: anode of power supply for the voltmeter
  4. Black: common cathode of measured voltage and power supply

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Working good.
A very nice little display to indicate voltage. Accuracy is also good. Can be used on battery packs, DIY power supplies, and basically, anywhere you don't want to hook up a multimeter every time you need to read off voltage!

For the power supply wire (red one), if the input voltage is applied in the range 28V - 30V, the small linear regulator inside the PCB gets very hot and will fail if you consistently apply 30V. Not a huge issue but something you should know!
Fast delivery excellent
good product
good product
I purchased this item for making a battery charger. It is small and compact and worth its value. the display is in red colour.
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