I am using a different more basic DROK monitor and it also has a hall effect sensor. Personally I prefer shunt based coulomb counters. I believe they are more accurate. I really like the JunTek I use with my Valence battery and I do recommend it providing one understands the few drawbacks it has and there are plenty of youtube videos explaining this.I was thinking about this one too, maybe even better?......
Charge-Discharge Monitor, DROK 0-90V 100A DC Ammeter Voltmeter, Battery Capacity Amp-Hour Watt-Hour Power Time Multimeter, LCD
It's probably overkill...but to be honest, I'm a tinkerer and enjoy it, so it's a hobby.