What would cause a Klein ET300 to Identify multiple breakers for the same outlet?
I have had trouble with the automatic modules like this in the same panel even with repeated checks as needed by the unit to identify the correct breaker the signal must be the same value on both breakers. The only way to be 100% sure is with very expensive meters +500$ like the greenlee CS8000. There is a trick I learned before getting an expensive scanner, installing an old fashion light flasher in a fixture (the small blue button that went under the lamp) and then look with an amp clamp for the circuit that was pulsing. This worked on circuits that could not be powered down. I haven't seen the little button flashers for a few years I am not sure if they are still sold. Also it takes a large wattage lamp an LED probably would hard to detect because the current draw is so small.