@kevin @MCDuncanLab
$30 IKEA Alpstuga - Best value CO2 air quality sensor.

CO2 may affect cognitive performance. Lets you know if you should open windows, turn on fan, or walk outside (especially with bad air circulation at work). Stepping stone to deciding to buy air filter.

If you like it as a clock, it’s a no brainer.
https://www.ikea.com/us/en/p/alpstuga-air-quality-sensor-smart-70609396/