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I use this. Mine is a bit older and lower range, but it will read up to 400 amps DC.
https://www.amazon.com/Sperry-Instruments-DSA540A-Function-Snap-Around/dp/B00279P6C4?th=1&psc=1
Another meter i use is this one.
This is typical of a meter that the leads are put in line of the circuit to read current draw.
But many meters like this are limited to 10 amps or less
https://www.amazon.ca/Ancor-Marine-Grade-15-Function-Products/dp/B018RR9O8G
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