🔋 Wireless Bluetooth Battery Monitor: Accurate Real-Time 12V Battery Voltage Tester for Auto Car Motor with Free Mobile App Review

The first one worked fine for about 2 weeks until it was removed to move the battery, after which it would not reconnect. You could see it in Bluetooth devices list but didn't communicate with BM2 app. I returned it and got a second one, worked a day, never turned it off, but it's the same with this one. Uninstalled/reinstalled app, cleared storage, restarted phone, uninstalled all other Bluetooth devices, unplugged/plugged monitor, nothing.

Caravan batteries. The great thing is that it provides a voltage graph over a 24-hour period and stores several days of history.

Wow, great product! Now I can see how well my 300 watt solar panel is supporting my batteries. And it seems to work well beyond the advertised range of around 100 feet. I would NOT be without.

I really like this little monitor, I have it on the solar array and it registers the battery voltage and when I drive to the battery bank it automatically downloads all the data. I'm looking to replace my solar panels with 24v and need one that runs on 24v and I'm going to mount it on my truck.

The monitor works, but accuracy may be reduced. It consistently showed 0.3 volts less than my DVM. Not a big deal, but worth mentioning. The application up to 100 feet is a complete joke. In a "real world" scenario, I could get about 30 feet outdoors and only 20 feet from home.