I've used a breaker finder for years. Mine can be a bit quirky. Today, it didn't trigger at all. That was ok. I was alone in the house and I just shut down the house and replace a couple of outlets.
But what I would really like is a finder that also transmits a RF signal over the air to indicate power as well as whatever tone it puts out over the line. That would serve as a backup to the tone for the cases where the tone doesn't work so well.
Anything out there?