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Ok I have a CO2 meter review video coming up but quick summary:
Every no-name Aliexpress CO2 meter under $100 sucks.
If they say they are NDIR they are probably lying.
The @AranetIoT is expensive but worth it.
The @TheatreCaps Mini CO2 monitor is an acceptable alternative. https://t.co/1LNdB41tWR
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https://twitter.com/CorsIAQ/status/1548469703227478017?t=7x85MZ9wPORwNw26a_Pl_g&s=19
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Time for another thread on CO2 in classrooms:
TLDR:
Determine the time it takes for the CO2 concentration in EMPTY classroom to decline from 1200 ppm to 800 ppm:
Good: Less than 9 minutes
Bad: More than 30 minutes
In between: Meh…. better get filtering
/1
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https://twitter.com/cohnkaren/status/1508472593539485700?t=tnS7YKPiZkcQLjNyYRyi-A&s=19
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