Title: Works only occasionally
Product review: For me this circuit tester works occasionally, but not on most circuits in my house or my daughter's house. They're both 40-year-old houses with a mishmash of wiring and lots of "cheater" circuit breakers (two breakers in a space made for one), so maybe that has something to do with the poor performance. I did follow the instructions very carefully, avoided the user errors that other reviewers have mentioned, and retried several times with each circuit.Amazon, as usual, made it quick and easy to return the tester for a refund.
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