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A comment on The hidden cost of air quality monitoring. Parent comment

Re:The hidden cost of air quality monitoring by breput on Tuesday June 27, 2023 @08:49PM (#36500829)
I have built CO2 monitors using MH-Z19B, Senseair S8 (same detector used in the AirGradient kits), and the SDC41 modules and my favorite is the S8. It seems equally accurate to the SDC41 and is easier to keep calibrated.

It also has a pin that is enabled when the CO2 level exceeds 1000 ppm so you can build a useful monitor using nothing more than an LED and an old USB power adapter.

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Re:The hidden cost of air quality monitoring by ahaucnx on Tuesday June 27, 2023 @09:07PM (#36500972)
Yes I agree. The SenseAir S8 is probably the best of the three. The SCD41 gives similar values indoors but at lower concentrations outdoors it seems to become less accurate. The MH-Z-19 is also pretty good but I think the S8 has a better built quality and less noise in the measurements.
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