After replacing the switch in my RV, I lost the voltage reading because I was using a different model of ATS. Not a big deal, but I still wanted to be able to control the input voltage. It was the perfect solution. Just plug it in and it will clearly display the AC voltage. I checked the accuracy with a digital meter and this monitor works without adjustment. I am very happy. As some have pointed out, it's also a good night light. I can pick up another just for this purpose.
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