Uploaded November 2025 | Updated September 2026, 2 weeks ago

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Thanks to commenters on my other video, my old Temtop CO2 monitor lives again!

Resources / other things I mentioned in this video (some links are affiliate links):

- Air Lab video: youtube.com/watch?v=r21lvaw40nY
- Temtop M2000C Air Quality Monitor: amzn.to/3Mkn4dv
- CR1220 battery pack: amzn.to/4oSAFqY

Support me on Patreon: patreon.com/geerlingguy
Sponsor me on GitHub: github.com/sponsors/geerlingguy
Merch: redshirtjeff.com
2nd Channel: youtube.com/@GeerlingEngineering
3rd Channel: youtube.com/@Level2Jeff

Contents:

00:00 - CO2 wasn't working anymore
01:42 - Replacing the CR1220 battery
03:09 - Did it work?
04:24 - Repairability is really nice
04:48 - I say what I want