The digital hot wire probe with integrated temperature and humidity sensors is the ideal solution for accurate and convenient airflow measurement in ventilation ducts. Designed for use with a compatible testo multifunction measuring instrument (sold separately), this robust wired probe measures air velocity (0 to +30 m/s), volume flow, temperature, and humidity with high precision.

A scaled telescope extends up to 1.0 meter and is optionally extendable to 2.0 meters, allowing easy access to deep or high-up ductwork. Thanks to absolute pressure compensation, the probe ensures consistent accuracy under changing environmental conditions.

A built-in button on the handle lets you store readings and manage measurement series directly at the measurement point, simplifying the workflow. The rotatable sensor protection cap helps preserve the sensitive hot wire sensor from damage and debris during transport or storage.

The probe is part of a modular system featuring a universal handle – connect various probe heads to reduce gear load and increase testing flexibility. Users can switch to a Bluetooth® handle (optional) for wireless operation or extend the reach with a telescopic extension for measurements in large-scale systems.

With Testo’s intelligent calibration concept, only the probe head requires calibration, ensuring minimal downtime and continued measuring efficiency.