I use them to monitor 2 24VDC batteries. Each battery voltage can be displayed at a 12 volt or 24 volt setting in combination with a shutdown setting to avoid wasting energy if not monitored for charging issues such as a low battery. I have a blue and green display, both are accurate, I can tell to within 0.05 volts, and it's wise to buy one for each 12 volt battery I use for my solar arrays.
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