The Testo 0632 1550 Digital CO2 Probe Head provides parallel determination of CO₂ concentration, humidity and air temperature in indoor areas, including long-term measurement. Wet bulb temperature, dew point and absolute humidity are calculated at the same time. The CO2 probe head utilizes absolute pressure compensation to ensure accurate measurement results. A universal handle with Bluetooth or handle with cable (both sold separately) can easily be attached to the probe head.