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Ever since I got a CO2 sensor, I've noticed a direct correlation between "foggy brain" and above average CO2 concentrations

What CO2 sensor do you use? Any recommendations?

Grandparent responded to my question and said https://www.co2meter.com/products/personal-co2-monitor?varia... In case you didn’t see it

Which CO2 sensor did you buy?

this one, it's 400$ and totally worth it. I've probably made up easily $400 in productivity in a month.