Testo 420 Flow Hood – HVAC Airflow Meter with Bluetooth

The Testo 420 Flow Hood is a professional-grade HVAC airflow meter designed for precise volume flow, air velocity, temperature, and humidity measurements. Engineered to handle turbulent air at swirl outlets, its integrated volume flow straightener ensures accurate readings, making it ideal for HVAC system testing and balancing. Weighing under 6.4 lbs, the lightweight and ergonomic design includes a tiltable display for comfortable use in large spaces or overhead applications.

With advanced Bluetooth connectivity, the HVAC airflow meter pairs seamlessly with the Testo Smart App for remote monitoring, data logging, and report generation. The detachable control unit doubles as a standalone instrument for additional pressure and duct measurements when paired with optional pitot tubes. Create and email professional reports directly from the field to streamline inspections and maintenance workflows.