Water pressure microphone used to detect water flowing through a pipe.
https://diqn32j8nouaz.cloudfront.net...microphone.jpg
Previously:
https://www.homemadetools.net/forum/...329#post158092
https://www.homemadetools.net/forum/...824#post100116
https://www.homemadetools.net/forum/...569#post143150
https://www.homemadetools.net/forum/...431#post122276
https://www.homemadetools.net/forum/...427#post131603
