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Re:Ask HN: What indoor CO2 monitor do you recommend? by sschueller on Friday June 21, 2024 @10:10AM (#40749812)
I really like the airthings view plus which also measures radon.

https://www.airthings.com/en/view-plus

Re:Ask HN: What indoor CO2 monitor do you recommend? by pawelduda on Friday June 21, 2024 @11:42AM (#40750725)
Been running the wave plus for 2 years and can recommend
Re:Ask HN: What indoor CO2 monitor do you recommend? by xnx on Friday June 21, 2024 @10:16AM (#40749859)
Seconded. Nice app that has good historical views and easy export of all data.
Re:Ask HN: What indoor CO2 monitor do you recommend? by azamba on Friday June 21, 2024 @10:30AM (#40750012)
+1 Airthings as long as you don't need any customer support.
Re:Ask HN: What indoor CO2 monitor do you recommend? by sliken on Friday June 21, 2024 @03:37PM (#40752891)
They have a github if you want to use it with your own graphana without requiring any cloud access: https://github.com/Airthings

I've got one per floor in a 3 floor house and all get to the BT -> wifi gateway reliably.