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Re:Show HN: I wanted to measure CO2 in my office, so I build... by maxk42 on Friday January 25, 2019 @01:37PM (#19000912)
This one on Amazon: https://www.amazon.com/gp/product/B001PDGFR8/ref=ppx_yo_dt_b...

Looks like they're out of stock now, but it has a big label on the front that says co2meter.com, so you might want to check there.

I am not affiliated with that company.

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