Top Positive Review for Voltmeter on Banggood|Shopping Philippines

30% OFF Geekcreit® 0.28 Inch 2.5V-30V Mini Digital Volt Meter Voltage Tester Two Line Voltmeter US$6.29 US$8.99 View It

Overall:

sector101 28/02/2016

I bought two of these RED LED units for a trial and was quite surprised by the accuracy. The little trimmer on the rear of the PCB can be adjusted to calibrate the reading. I calibrated it at 12V and found it matched all input voltages from 4V up to 29.9V. Also as a bonus you can use an independent input for the reading. Simply remove the 0R resistor from the PCB (beside the trimmer) and hook an extra wire up to the spare hole beside the (+) input. Power the unit up (5V - 30V) and it will read from 0 to 29.9v using the independent input. Using this method it should be possible to get any colour LED unit to do the same.

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