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by jck 1229 days ago
I got a xiaomi co2 monitor off AliExpress a while ago for about 60£ :https://m.aliexpress.com/item/1005001768799038.html

It works well enough and home assistant integrates with it. I cannot comment on it's accuracy since I've never owned another CO2 monitor as a reference. However, it is very responsive to the various things I've tried to manage CO2 in my bedroom - such as opening the windows to differet degrees, position of my curtains etc.