In article ,
says...

They have testers to locate breakers, where you plug a widget into the
receptacle and it injects a signal that the handheld tester then can
sniff at the panel.



Interesting. Never heard of this. Will research it. Thanks much!




I don't know how well this one will work, but here is an example.

https://www.lowes.com/pd/Southwire-A...r-Finder-With-
Gfci/50133086