Not bad, not great either.

For use in a vehicle to monitor an auxiliary battery it's not the best, and the quality matches. It would be better suited for a standalone battery system. Charging with the vehicle alternator doesn't always trigger the voltage threshold for metering charge time, so the displayed Ah and battery life aren't true. If you know for a fact you're starting off with a fully charged battery and parking without, then it works. If you're not concerned about remaining battery life and want to monitor usage overnight or between charges, then it does a good job. I docked another star for the cheap construction; there's a gap between the LCD and clear outer protector and it's very weak; a slightly firm poke and it caves in. Wouldn't stand up to kids who expect everything to be a touch screen. The USB connection is also very touchy.

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