Volume Flow Capture Hood Testo 420 is a lightweight, accurate, and user-friendly solution for measuring volume flow at large air inlets and outlets. When used with swirl (twirl) outlets, the integrated flow straightener significantly reduces typical measurement errors, ensuring reliable results. Designed for fast and precise airflow capture in HVAC systems, it enables frequent measurements in large spaces. Measurements above head height can be carried out comfortably and safely, thanks to ergonomic handles and a tiltable display, while the optimized design helps reduce the overall instrument weight. This Volume flow capture hood measuring instrument allows measurement of air velocity, volume flow (air capture), absolute pressure, temperature, and relative humidity. Automatic zeroing improves accuracy, especially when measuring low pressures. All measured values are clearly visible on the large, illuminated display.  Applications:– Clean Rooms, Office Rooms, and Industrial Environments, etc