Vash, if you go cheap, make sure to get one that is out off. Not all are.
Also, if all you want to do is check battery levels (12v?), I bought a couple of water proof digital voltmeter gauges and plan on putting clips on them for in the boat and ice fishing house. Advantage? No batteries to go dead.
Something like this:
 https://www.ebay.com/itm/Waterproof-Monitor-12V-Battery-Meter-2-5-30V-DC-Auto-Gauge-Digital-Voltmeter-LED/171568461831?hash=item27f246f807:g:JycAAOSw0vBUgDG d
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