I'm sure there are competing products. But as a non-electrician I really like it. I don't need to relearn the functions of a multimeter to understand this. It took me a few seconds to trace my doorbell's wiring and make an audible noise. I wish I had had this many years ago when renovating a 1950's house and replacing much of the wiring that was installed incorrectly by the homeowner. One of the best products I've bought.
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