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by whitepoplar 2975 days ago
this one is best: https://www.amazon.com/CO2Meter-AZ-0004-Temperature-Relative...
1 comments
blacksmith_tb 2975 days ago
I haven't tried either, but the parent has a +/- 50ppm margin, and this one[1] is +/- 5...

1: http://a.co/afxamMd

link