Adafruit SCD-30 - NDIR CO2 Temperature and Humidity Sensor [STEMMA QT / Qwiic] : ID 4867 : $58.95 : Adafruit Industries, Unique & fun DIY electronics and kits
VOC Monitor CO2 PPM Sensor Family Intelligence System for 0-10V RS485 Regulator Release Valve/Fan Humidity Temperature Detector - AliExpress
Tiny sensor delivers direct CO2 ppm readings - Embedded.com
Industrial NDIR CO2 Sensor for HVAC, 0 to 2000/ 6000 ppm | ATO.com
BWSCO2 WiFi CO2 sensor - Bindelo
Amazon.com: CO2 Monitor Air Quality Monitor for Carbon Dioxide Humidity Tempeture NDIR Sensor CO2 Meter Controller with Relay Function for Grow Room Home Office : Industrial & Scientific
Gas Sensors Aeroqual Carbon Dioxide (CO2) Sensor Head 0-5000 ppm (CE) - Gas-Sensing.com
mPower POLI MP400 CO2 (NDIR 50-50,000 ppm) Smart Sensor
Amazon.com: DFRobot Gravity: Analog Infrared CO2 Sensor for Arduino (400~5000 ppm) : Electronics
HESSWAY RS485 CO2 PPM Sensor Controller for Air 0-10V/AC Fan Quality Monitor Indoor Outdoor Humidity Temperature VOC Detector - AliExpress
TrolMaster CO2 Sensor for Carbon-X System
Vernier CO2 Gas Sensor Sensor Type: Carbon Dioxide:Data Logging and Monitoring | Fisher Scientific
Sensor, IR, Carbon Dioxide (CO2) 0-5000 ppm, explosion proof direct connection (no transmitter, no j-box), cULus version – Bomark Instruments
Amazon.com: SITERWELL 3-in-1 CO2 Detector Monitor, Indoor Air Quality Monitor with Real-Time CO2 PPM Levels Display, CO2 Meter with Test Button, Temperature & Humidity Detection, During Cal Wildfire Season, White : Industrial