I use this Linkstyle car voltmeter DC 12v 24v to monitor the charge on my trolling motor. I built it right into the battery compartment so I always have it in front of me. Since it's waterproof, I got this one. I ruined a couple of multimeters using them on the boat so even if this one gets damaged I'll lose nothing but a few bucks. It serves its purpose and matches the voltage of my multimeter.
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