Jaycar do a digital dual battery volt meter for just a tad over $100
its direct voltage measurement for one battery and volts / amps via a shunt on the other
great idea to monitor the house batteries without the need for 2 or more meters
A $4 cigarette lighter voltage meter also measures battery condition. I can switch between the 2 truck batteries so it can monitor either or both. I have the same thing in the camper for the house battery, so I guess the price is now up to $8.
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