With the help of the compact 16 mm vane anemometer testo 416 with telescopic probe and mobile app, you can measure the air flow velocity in the ventilation ducts of air conditioning and ventilation systems easily, quickly and precisely. The integrated telescope can be extended up to 850 mm, making it easier to work in hard-to-reach places on the ceiling or in large-diameter air ducts. Testo 416 automatically calculates time and point averages as well as flow rates. And thanks to the compact design and robust housing, the anemometer is also suitable for operation in harsh conditions. Configuration of the measuring device, visualization and storage of measured values, as well as documentation are done easily and conveniently with the testo Smart App. It turns your smartphone into a second display.