The Robust Humidity Probe is a versatile tool for measuring relative humidity and air temperature in a wide range of environments, including storage rooms, refrigerated areas, workspaces, and air conditioning/ventilation ducts. When paired with the testo 635, it can also measure the material equilibrium moisture content in a variety of materials such as concrete, wood, and brick.

This probe offers an impressive temperature range from -20 to +125 °C (with short-term tolerance up to +140 °C), making it ideal for applications in challenging environments like air exhaust ducts. The material moisture measurement function, available when connected to the testo 635, allows users to calculate the H2O content of specific materials, such as: Anhydrite flowing screed, cement flowing screed, lime sand brick, concrete, high-insulation brick, solid brick, hard wood, soft wood, aerated concrete and particle board

For use with other instruments like the testo 435-2 and testo 435-4, the probe can measure humidity and temperature but does not provide material moisture content measurement.

Built to endure demanding conditions, this robust probe ensures accurate, reliable data collection in diverse industrial, HVAC, and building monitoring applications.