Paladin
Contributor
Aw, Duckie, I knew you were just joshin! I saw the post for what it was and I knew what you meant! (Although I considered putting a "mooner" in my answer just fer kicks!)
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Hey, Paladin, I hope you know I was just kidding. It was a play on words
I have several, and use them from time to time. I think the best part of using them is they provide a visual reminder of the effects of pressure. I think every new diver should have to use one at least once during training as it physically shows how an air column is compressed by the water pressure at various depths. Illustrations in a textbook showing the effects of Boyles Law are O.K., but actually seeing it in action in a capillary gauge really drives it home.