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I’m sure some of the features work well but I was trying to use it to find amperage that was tripping my 30amp breaker. Regrettably, I tried it repeatedly while turning on the appliance that was causing the fault but it never picked up any amperage. I’m guessing it doesn’t take measurements quickly enough to capture the trip.
Other features like wattage may work fine but I already have a meter for that so I haven’t even tested it on this device.