This product works as advertised. I am planning to use this gauge in a backup power supply for ham radio and related equipment. What I like about it is that it can be used as a 100 or 50 amp meter. Since I will be using it for about 30 amp circuits (total), I decided to program it for a maximum of 50 amps. Of course, this required a 50 amp shunt, but that wasn't a problem. Pay close attention to the instructions as the programming, while not difficult, is not obvious.
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