Carbon dioxide Meter, placed inside a mask. Normal levels are 450 to 700 parts per million

First published at 01:54 UTC on January 22nd, 2021.

Carbon dioxide Meter, placed inside a mask. Normal levels are 450 to 700 parts per million. Watch the meter for yourself. Insane
https://twitter.com/pleasestoplyin/status/1351688928168865792?s=20

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