Large Surface Vane Anemometer Testo 417 is a highly reliable Air Volume Flow Meter designed for fast and precise readings at air inlets and outlets. It accurately monitors airflow speed, volumetric flow, and temperature, making it an efficient air velocity meter for HVAC applications. Its coordinated vane design ensures stable performance, while features like mean time value, average, min/max, and Hold mode enhance usability. With the optional Vent 417 funnel set, it also functions as a ventilation flow meter for detailed airflow analysis at grilles and disk valves. Applications: Ventilation and A/C systems, Refrigeration Technology, Indoor Air and Comfort.