The Testo digital vane probe (Ø 16 mm, wired) is designed for precise airflow and humidity measurements in confined ventilation ducts. It connects via fixed cable to a compatible Testo multifunction measuring instrument (sold separately). With its integrated, scalable telescope that extends to 0.85 m, this probe enables effortless insertion and accurate depth control within ducts. It covers a wide measurement range from +0.6 to +50 m/s, providing fast, intuitive volume flow calculations through structured menu navigation. The intelligent calibration concept enhances operational efficiency by requiring calibration of the probe only—not the measuring instrument—allowing continuous system usage.