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A comment on Indoor carbon dioxide levels could be a health hazard.

Re:Indoor carbon dioxide levels could be a health hazard by spookybones on Monday July 08, 2019 @04:32PM (#20386473)
Anyone know if there is a decent and affordable test kit for bedroom or small office?
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Re:Indoor carbon dioxide levels could be a health hazard by QuickToBan on Tuesday July 09, 2019 @10:57AM (#20392397)
https://www.amazon.com/gp/product/B01FYWU2IS/

It works well.

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Re:Indoor carbon dioxide levels could be a health hazard by Rch_East on Monday July 08, 2019 @11:40PM (#20388835)
https://www.aliexpress.com/item/32887570197.html $90

PM2.5/ HCHO/TVOC CO2

I have this exact model and it works very well. I keep my apartment window openly constantly whenever I'm home now (though my place is pretty small).

I live in a 60m2 cheap apartment and if I keep the place closed, CO2 levels will exceed 800ppm in about two hours just from one person breathing.

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