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  Wow, thanks for posting this. I use these sensors and I never knew what was inside other than the principle they’re based on. I also use SHT41 in conjunction and both the SDC40 and SHT41 show almost the exact same temperature and humidity values which is now easily explainable by the fact there’s a SHT40 inside this CO2 sensor! I won’t use SHT41 anymore when a project already includes this CO2 sensor, awesome!