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These look like a useful bit of gear. Monitors that do what this one does usually cost $200 to $400.
Comes with the shunt & shows voltage, amps in & amps out, battery percentage (State of Charge), time to full charge (at current charging rate) & more.
In fact it does all that my NASA BM1 ‘Compact’ monitor does which I bought at a bargain price of $140 (usually closer to $240).
I have no direct experience of these units but do know of one person who is using one successfully & he is not someone likely to accept rubbish.
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)