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Large Screen LCD Display Lead Acid Battery Capacity Meter Voltmeter Size information: Shell:42*70mm, Screen:35*55mm Features: large screen, easy for you to read digital display multi function, can test battery capacity, battery voltage reverse polarity protection lightweight and easy to carry suitable for most lead acid batteries 12V, 24V, 36V available can be used in motorcycle, golf cart, boat, solar systems, etc USING GUIDANCE: FF: full capacity, 100% 00:0% capacity connect the red wire to the battery positive pole, connect the black wire to the battery negative pole, then the meter will show the battery capacity and battery voltage meantime.