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A comment on Indoor CO2 may reach levels harmful to cognition by the end of this century. Parent comment

Re:Indoor CO2 may reach levels harmful to cognition by the e... by dotancohen on Saturday September 19, 2020 @02:05PM (#24529312)
Can you recommend an affordable device? $100 for the Extech CO200 is just too expensive to suggest to people who have just a passing interest.
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