[amdolan]

I found this on what eCO2 is:

https://ec.europa.eu/eurostat/statistics-explained/index.php...

Re your other questions; yeah I gather there is some experimentation involved, even with out of the box commercial products.

If others have suggestions on chips or products to buy for the household, I would greatly appreciate it! The MH-Z19 looks like an option for me. Commercial products seem too unreliable for the price.

[beefield]

I think that is CO2e, which should be a different thing to my understanding. (CO2e is used to estimate the greenhouse gas potency of other gases like methane. Whereas I think eCO2 is some kind of estimate of amount of CO2 in the air, but what, exactly, I do not know)

[regen]

Mine from Amazon is accurate enough to remind me of opening the window