I found in the trash, near a clinic, these two identical transducers. They have connections for a tube and an electrical connection with four conductors. They look like they have some kind of optical detector.
I suspect the most likely use is they detect drops as they fall OR they might detect liquid level in the chamber. Maybe those serum bags you see in movies.
If you search Google images for serum drip transducer you can find similar-looking things.
Before I tear into them and destroy them I wonder if anyone is familiar with them and what kind of electrical circuit they might have. I wonder if the optical transducer can be put to any useful use. Maybe a drip watering system for delicate plants
