[uranium]

I carried a CO2 meter on a flight recently, to use CO2 as a proxy for COVID risk. The levels were quite high for the whole flight--over 1000 pretty much the whole time iirc and worse on the tarmac.

[c0pium]

How did you calibrate the meter for the changing temperature and pressure? Most CO2 meter designs are extremely sensitive to pressure changes.

[uranium]

It's a cheap portable, with no calibration possible. I have no idea what effect pressure would have on it, unfortunately.