Normally a high CO2 level will go hand in hand with the air feeling stuffy from other pollutants that build up at the same time, so there's hardly a need to continuously use a CO2 meter as you can easily notice when the air "goes bad". CO2 buildup is quite predictable in most closed rooms based on the number of people inside, the room volume and the ventilation as well, so you can just work out a ventilation schedule and stick to that instead. Common sense often beats smart gadets.
Personally I have a CO2 meter in my tiny office room but I don't need to look at it as I pretty much know that it will be in the red after being in the room for a while with the door closed.
Personally I have a CO2 meter in my tiny office room but I don't need to look at it as I pretty much know that it will be in the red after being in the room for a while with the door closed.