We have 2 in stock.
For use with the Testo 417.
The patent-pending volume flow straightener (testovent 417) reduces the swirling air flow coming out of a swirl outlet, and changes it into an almost uniform flow. The influence of the swirl on the rotation of the vane decreases, and the volume flow can be measured quickly, easily and reliably  for example with the testo 417 vane anemometer.
The volume flow straightener can only be used in combination with a funnel (funnel set testovent 417) and a measuring instrument. The following options are available as measuring instruments:
 Vane anemometer testo 417
 Reference measuring instrument testo 480 in combination with a 4" (100 mm) vane probe
 Multi-function measuring instrument testo 435 in combination with a 4" (100 mm) vane probe
