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I put one in my son's bedroom and was blown away. He's 3, and calls me in to sleep with him sometimes. It's a small room, and we keep the doors closed so his sister doesn't wake him up and I was blown away by how high the CO2 got with both of us in there: https://www.reddit.com/r/dataisbeautiful/comments/cek4dm/co%...

What did you use to measure? Unfortunately all the ones I've seen linked here are too expensive for someone like me who doesn't live in America. I wonder if there are cheap ones out there that maybe not so precise but at least measure something.

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