This voltage monitor wast of money ! It does not give a accurate reading ! With a full charge (12.8 VDC)the meter only reads 50%. Even right after removing from charger with 13.3 volts the unit only reads 70%. There is no provision to calibrate the unit. I also purchased a ASC Mark15-12 unit with display and LED bar graph. The ASC bar graph worked perfectly. I would get a digital voltage meter display for monitoring battery. This unit needs to be redesigned by B.Z Products. I would not purchase anything made by them after getting this meter. When I called the company they were not vary helpful and tried to say that nothing was wrong with the meter !

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