Bought two of these instruments for my boat. One reads 1.25V lower than the other with the same test voltage source. There's no trim potentiometer on the back, so you can't calibrate the voltmeter if it's out of spec. I have contacted Faria and they have confirmed that they are "calibrated" at the factory (I use the term loose) and are not serviceable. This feature alone would make these 5*s stand out as they look great!
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