The compact testo 417 vane anemometer in Set 2, including two measuring funnels and a rectifier, has been developed to make it as easy as possible for you to take measurements on air inlets and outlets as well as on disc valves and swirl outlets in air conditioning and ventilation systems. The integrated 100 mm impeller quickly provides precise results. Temporal and punctual mean values as well as the volume flow are automatically calculated in the device and shown on the display. This means that controlled domestic ventilation systems can be regulated particularly efficiently - including quick documentation with the testo Smart App. The app not only supports you in configuring the measuring instrument and displays, saves and documents the measured values - it also turns your smartphone into a second display. The testo 417 Set 2 includes two measuring funnels and a volume flow rectifier for precise results, even at swirl outlets.