The hot ball probe (digital, Ø 3 mm, wired) is a specialized thermal anemometer developed for the precise measurement of low, non-directional airflows and temperatures in environments where the direction of flow is undefined or variable. It is particularly well-suited for cleanrooms, laboratories, and HVAC systems with low airflow.

Thanks to its compact probe head diameter of just 3 mm and an integrated telescope that extends up to 860 mm, the probe allows easy access to confined or hard-to-reach areas. It reliably measures flow velocities up to +10 m/s and temperatures up to +70 °C.

The probe features automatic absolute pressure compensation, ensuring highly accurate measurements even in changing ambient conditions. Its digital design processes data directly within the probe, eliminating instrument-induced measurement uncertainty.

Additionally, the probe supports Testo’s intelligent calibration concept, allowing you to calibrate the probe independently from the measuring instrument, reducing downtime and ensuring consistent performance.