What is this unidentified cylindrical device with a wire?

Question

Electronics

Found just such a device, made qualitatively. Massive, has two plugs with inscriptions L and K, they are twisted out. the wire has a 5 pin connector. What is this thing?

It doesn’t fonite in the range, just in case, I wrapped it in a bag and put it away, it’s very interesting what it is.

Answer 1

It looks like a part of an ultrasonic sensor, Soviet times))

Answer 2

Very similar to the ultrasound head.

Answer 3

Possibly a stethoscope. It depends, of course, under what conditions you found it and where

Answer 4

Asked - must be answered. Photos do not cause any associations, I have never met with such a person. Medicine, ultrasound - yes, maybe. Dismantling will give a more accurate answer, but I'm afraid that as a result, its device may lose its functionality. If you don’t feel sorry for losing it, open it and complete your question with photos of the insides, and then we will supplement our answers (do not forget to check the box for our notification of changes to the question).

Answer 5

Most likely a seismic sensor.
Ultrasound is unlikely, because a plastic pimp with a logo is not very similar to the place where the ultrasonic vibrations are output.
Measure the resistance on the connector, most likely there will be several kilo-ohms between the terminals, and when the sensor fluctuates, voltage will appear on them.