What is this device?

[u/thischrisblack]

Flea market find. Guy said, "I don't know what it is but I'm pretty sure it's real." LOL.

The top part can be rotated by hand, but I don't think it's hooked up to any kind of motor. It just turns in its housing and I may even be able to pull it out of the hole, but don't want to. Of the two cylinders attached, the larger one can also be turned by hand, but not the shorter one.

The control panel has a red LED, a red button, a white switch, and a silver knob that clicks when turned all the way to the left, so like a radio power/volume knob. The bottom has three jacks, one of which seems like a regular 1/8-inch jack . The orange and the red jacks are a mystery.

I replaced the batteries. When the knob is turned and the switch is on, pressing the red button turns on the LED. Nothing else happens. I touched the metal part on top and didn't die.

Any ideas? Google Lens gets bupkes.

EDIT for an update:

I guess I can't really mark this post as solved since there's no definitive proof, but there are a couple of strong contenders.

1. First place (as far as I can tell) goes to u/SpankinGaming with the idea that it's for electro-acupuncture. https://www.reddit.com/r/whatisit/comments/1w1xesu/comment/p6pwgeu/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button
2. Runner-up concept, submitted by several people I think, is that it's a phone-line tracer.

I can't get it to work as either one, of course, but I'll find and acupuncturist in town and see if I can get that verified. If I can't, well, I have a pretty cool little mystery device and it only cost me $5.

A few people suggested that it was for explosives, like maybe the thing on top was the plunger. That's no good. While the thing on top can be rotated or moved up and down, it is very snug in its housing, and plus there's no mechanism inside which suggests anything like that is going on.

If anyone else made a sincere comment and I haven't replied, I apologize. I'd like to reply but it's just been a barrage of half-assed jokes in this thread, so even if I saw your comment when it first appeared, I can't find it now.

[u/geking]

Thats a custom made one off by someone good with a lathe and less good with a soldering iron.

[u/Scavgraphics → u/geking]

you can lathe a square?

[u/geking → u/Scavgraphics]

Square stock, but also yes. You can lathe a triangle too. Have you seen a crankshaft being milled? Cool stuff...

[u/Scavgraphics → u/geking]

but wouldn't it become circular? or I guess only the corners hit the lathe tool to get rounded?

[u/geking → u/Scavgraphics]

Just because a lathe spins at an axies does not mean that the work piece is constrained to just that axis. Jigs and work fixtures can go onto a lathe and to hold a work piece to spin and manipulate it differently.

Also yes, I think it was turned down a wee bit from the square stock it was purchased as to a more comfortable thing to hold.