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CO meter for sure, but a CO2 meter? It's actually a good idea to have CO alarms in your house if using natural gas powered appliances. However CO2 is only a concern if you're in a hermetically sealed environment like a submarine or space ship. I suppose it could be useful to check proper ventilation in the home, but normally you can just open a window.
Anyway the Earth has a carbon cycle, in other words it filters natural CO2 emissions through environmental processes. The problem is the amount added by industry is more than the natural carbon cycle can process. So levels are steadily increasing.
When we talk about zero carbon footprint we mean sources from industry like driving gasoline powered cars, generation of electricity, and production of consumer goods. A good amount already comes from natural processes like volcanos and erosion so we don't actually need a zero carbon footprint, just need it low enough to avoid overwhelming the natural cycle.
At a personal level it would be just about impossible to have a zero carbon footprint. If you had a solar and wind powered home off-grid and used it to charge an electric car you could be well below average. However any consumer goods you use put carbon in the air to produce them. Even if you went full native you'd still be putting carbon in the air burning wood and candles.
Actually the CO2 meter showed levels in my home during the day at 1350 (I think over 1000 is bad - 10% cognitive decline I think occurs at 1500) and in the morning over 2100 in my bedroom! The AC turns off and the CO2 just builds up I guess.
I did the research to see if any amount of houseplants could offset it (nope), but yes, opening a window is exactly the solution. Problem is I live in Florida and it is way too hot to do that. So I compromised and turned on a bathroom vent all day and it is keeping the levels to around 800 per day. It basically is slowly sucking air through the not perfectly sealed home and expelling it through the roof.
But I recognize now my AC will have to work harder to cool the incoming air and make my home less efficient, thus doing worse overall. Happily we have a nuclear power plant here but still.
Most people use CO2 meter at home to measure air quality. If you're in room that is not well ventilated, depending on the size of the room, CO2 will reach pretty high levels within minutes. Unless it's really bad, it's not high enough to kill you (which is why people have CO detectors) but spending long time in the environment (hours) might cause issues with how well you can focus, trigger headache or migraine, cause tiredness if this is your bedroom, etc..