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A comment on I Bought a CO2 Monitor, and It Broke Me. Parent comment

Re:I Bought a CO2 Monitor, and It Broke Me by bookofjoe on Saturday February 04, 2023 @05:29PM (#34659101)
Not Aranet4
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Re:I Bought a CO2 Monitor, and It Broke Me by schmichael on Tuesday February 07, 2023 @10:35AM (#34694126)
Yes you do. Once a year: https://aranet.com/faq/

Their data sheet also advises calibration if used at “high elevation.”

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