[PSUBS-MAILIST] DIY CO2 monitors

[Michael Holt via Personal_Submersibles]

For me, a very interesting thing is that Forrest Mims designed one of 
the monitors, and he refers to a Radio Shack part.  I thought Radio 
Shack was long gone (like Fawcett Publications, Herbach and Rademan, J. 
J. Meshna, and others).  It exists: https://www.radioshack.com/

I also thought Mims was a lot older  than he turned out to be:
http://www.forrestmims.org/biography.html

That issue of /Make /also has an article on a shark tracker. That might 
suggest some other underwater projects.




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