Looking for an accurate, low-cost CO2 meter? I show you the best- and worst options.

Aranet4
https://amzn.to/3zwRDTr

Vitalight/Mini CO2 Monitor
https://DONATEMASK.CA/STORE
https://amzn.to/3P2yv5B

Qingping Air Monitor Lite
https://amzn.to/3d8DXGu

Sensirion Gadget
https://www.digikey.com/en/pro....ducts/detail/sensiri

The Hot New Back-to-School Accessory? An Air Quality Monitor.
https://www.nytimes.com/2021/1....0/10/health/coronavi

Exhaled CO2 as COVID-19 infection risk proxy for different indoor environments and activities
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC80431

CO2 concentration monitoring inside educational buildings as a strategic tool to reduce the risk of Sars-CoV-2 airborne transmission
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC82536

Assessment of CO2 and aerosol (PM 2.5, PM 10, UFP) concentrations during the reopening of schools in the COVID-19 pandemic: The case of a metropolitan area in Central-Southern Spain
https://pubmed.ncbi.nlm.nih.gov/33785326/

How can ventilation be improved on public transportation buses? Insights from CO2 measurements
https://pubmed.ncbi.nlm.nih.gov/34848209/

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