The Testo 0554 4172 is a Flow Straightener (Testovent 417) that enables a correction of the swirl into a parallel flow from air conditioning outlets. Testo is the only manufacturer to offer a solution for swirl outlets. * More accurate volume flow measurement independent of the swirl direction * Reliable measurement results on swirl outlets * System compatibility with the 100mm vane probes of the testo 435 (0635 9435), 400/445 (0635 9340) and 480 (0635 9343) * Manufacturer's part: Testo 0554 4172 Flow Straightener (Testovent 417) https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2025-01-19 https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2025-03-30 https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2025-05-15 https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2025-06-21 https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2025-07-30 https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2025-08-19 https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2025-09-30 https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2026-03-07 https://elecena.pl/product/27719653/testo-0554-4172-417-flow-straightener 2026-03-31