alt Hacker NewsI was looking at CO2 sensor module boards this week and the sensors themselves are quite large and the floor price is $15ish.
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bjackman • today at 9:09 AM
And I believe the accuracy is also not great on these cheap ones. The product in the OP's photo costs $200 where I live! And ISTR finding the sensor itself contributes a lot to this cost.
IIUC they also need fans. The one I have in my home has one that's actually integrated into the sensor unit.
Those $15 ones are also straight up scams. They just estimate (lie) for the readings based on other sensors.