Hello, friends. Could you help me identify these devices? They present in The Big Bang Theory TV show. I have already checked fan websites. They didn't help. I was able to find photos, but have no clue what they are for. Please tell me the purpose of the device. If you could tell me exact name and model It would be awesome. Sorry for the small size of some pictures, but it is the best I could find.
2.It is written that it is a pressure gauge. Not sure if it's true - I couldn't find even similar