SparkFun CO₂ Humidity and Temperature Sensor SCD40: www.sparkfun.com/products/22395
SparkFun CO₂ Humidity and Temperature Sensor SCD41: www.sparkfun.com/products/22396
This SparkFun CO2 Humidity and Temperature Sensor features the next-generation SCD40 and SCD41 photoacoustic CO2 sensors for high-accuracy environmental readings. We've written an Arduino library to make reading the CO₂, humidity, and temperature very easy. It can be downloaded through the Arduino Library manager on the product pages.