You are not going to get an accurate CO2 sensor for $27. You're being misled into buying cheap Chinese crap.
An accurate CO2 sensor is much more expensive. I would not trust the readings of the sensor in this blog. It's going to be off by over 100ppm, especially if there's a lack of good airflow.
An accurate CO2 sensor is much more expensive. I would not trust the readings of the sensor in this blog. It's going to be off by over 100ppm, especially if there's a lack of good airflow.
https://www.atlas-scientific.com/product_pages/probes/ezo-co...