[PSUBS-MAILIST] DIY CO2 monitors

[Michael Holt via Personal_Submersibles]

In the  current issue of /MAK//E /magazine, there's an article called 
"Fresh Air." Instructions for making several different monitor start on 
page 24.  One of them is small enough to fit into a large finger ring.  
I've not done anything like that for 40 years, so I'm not going to think 
about evaluating it.

The article is "ROBO-BOAT."  That's about an autonomous boat.

$14.99, so it's a bit expensive for a magazine.
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