We use the MZ, SCD as well as Senseair S8 and in my opinion all of them give a good enough accuracy. The build quality of the S8 and SCD is a lot better though.

We use the MZ, SCD as well as Senseair S8 and in my opinion all of them give a good enough accuracy. The build quality of the S8 and SCD is a lot better though. The most important thing is to stay away from eCO2 (estimated CO2) that some TVOC sensors offer which is very inaccurate.