I've been using it at my RV rental in Lake Tahoe for over two years. It is used on a 30 amp line and we have never had a problem with it. It's easy to use and we don't worry about losing readings when PG&E has a power failure. It's a great value at $25 and I would recommend it. We will be buying a second one for our LA rental. By the way: The nominal frequency of 50 Hz should not play a role with this device, since it is an analog measuring device that measures the internal load. It's close enough for us. :-)
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