fuuuuuuuuuuuuck, woke up to 1832PPM of CO2 in my bedroom
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https://www.amazon.de/TFA-Dostmann-AirCO2ntrol-CO2-Monitor-Kunststoff/dp/B00TH3OW4Q … These have USB and a 4 pin header with a custom protocol.
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Looks the same as this one, but it's not available on .jp :(pic.twitter.com/dvTI8lhKWq
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this is the one I'm using: https://amzn.to/2XGozHw there are a couple newer versions out there with data export functionality as well my only main recommendation is that you get something that supports explicit fresh-air calibration; it's not great but it's better than nothing
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(the _really_ high-end ones use actual zero calibration in a box of nitrogen, but those aren't exactly affordable, and outdoor-air=400 is gonna be within a few percent)
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