[marcus0x62]

When goofing off while tracing wires with a tone generator[0], we used to press the detector wand into our head, lick our finger tips, then run our fingers along the contacts on the 66 block[1] until we heard the warble from the tone generator.

0 - A troubleshooting and wire identification tool consisting of a battery-powered generator that produces a distinctive warbling sound and an inductive detector with a speaker that allows you to hear the warble when placed near the correct wire pair. Most look like this: https://www.grainger.com/product/EXTECH-Tone-and-Probe-Kit-4...

1 - a wiring terminal commonly used in the telephone system. https://en.wikipedia.org/wiki/66_block

[chaorace]

Those tone probes are so fun to play with! I highly recommend anyone with a spare $15 to grab a cheapo model and just... run around the home with it. It's an enlightening experience to actually perceive with your own ears the normally invisible world of EM radiation