I have one of those too, and it's useful. I use it to keep an eye on the Ford battery. But like Jim said, they won't measure "current, amperage". A battery monitor, with a shunt will tell you "How much current am I using *now*?"
A voltmeter, like what you bought, will tell you >>>>>approximately<<<<<< how much charge is left in my battery.
Very, very approximately.
With a lot of caveats.
If we use the Battery as a Lake analogy:
The voltmeter will tell you "How much water is left in the lake?"
The battery monitor will tell you "How fast am I draining the lake?"
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2016 Greyhawk 31FK
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