Testo 417 Vane Anemometer - Kit 2 with Funnels & Flow Straightener The Testo 417 Kit 2 is the complete version of the 417 vane anemometer, adding two funnel sizes and a flow straightener to the same 100mm integrated vane used in Kit 1. It's built for the full range of HVAC work — duct testing, ventilation commissioning, swirl outlets, and any application where turbulent airflow would otherwise compromise reading accuracy. The instrument itself is identical to Kit 1: the same 100mm vane, automatic time and point average calculations, Testo Smart App connectivity, and 50-hour battery life from 3 x AA batteries. The difference is in the accessories. The two funnel sizes extend the range of outlets and grilles that can be measured accurately, while the flow straightener conditions turbulent or non-uniform airflow before it reaches the vane — a re