CO₂ Humidity and Temperature Sensor - SCD40 (Qwiic) This SparkFun CO2, humidity and temperature sensor incorporates Sensirion's new generation of SCD40 photoacoustic CO2 sensors for highly accurate environmental readings. The sensor is capable of detecting concentrations from 0 to 40000 ppm with high precision above 400-2000 ppm ±(50 ppm+5%). The SCD40 has an integrated CMos® temperature and humidity sensor for greater precision. Code SP097 Last items in stock Price €74.95