Send me a PM, I have several at the house, and I know of several kits that are available for playing with these, I was in the process of making a water flow sensor but have shelved the project since we will soon be getting new radio equipped meters. I have many parts left over from this project.
As for how they are made, an internet search will get you that information.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
Last edited by villagetinker; 12-02-2024 at 10:24 AM.
Reason: added info.
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