Expand your 440 series instrument's repertoire with this air quality probe head from Testo. Integrated CO₂, temperature and humidity sensors help you to work out absolute pressure compensation and wet bulb temperature, as well as dew point and humidity. Clip this versatile probe into your universal Bluetooth (176-5604) or wired handle (176-5605) so you can keep up with conditions in your building or ducts.

• Light weight of 60g means it's easy to handle
• Accuracy of +0.5°C for precise temperature readings

• HVAC systems
• Building management
• Laboratories
• Manufacturing controls

For versatility, this probe head has a temperature measuring range between 0°C and +50°C, an absolute pressure range between 700 and 1100hPa and an ambient CO₂ range between 0 and 10000ppm.