Simple Digital Voltmeter (range 0 - 30V)

The voltmeter allows to measure Voltage from 0 to 30V. For the measurement under 4V requires an external power supply (in range 5 V - 30 V). See the operation manual for examples.

How to use:

1) The red wire connect to the (+) battery terminal
2) The black wire connect to the (-) battery terminal
3) The blue wire voltage measure the voltage on (+) battery terminal, or cell (+)

Check here:
http://www.ev-power.eu/Measure-Test-Tools-1-1/Promo-Voltmeter-for-measuring-of-voltage-in-range-0-30V.html