🌬️ Elevate Your Airflow Game! Telescopic shaft extends to 15" for hard-to-reach areas. Bluetooth 4.0 for seamless smartphone integration. Compact design makes it ideal for on-the-go professionals. Accurately measures air velocity, temperature, and in-duct airflow. Smart Probe App for real-time data visualization. Lightweight at 119g 15" telescopic reach Bluetooth 4.0 connectivity The testo 405i Hot-wire Anemometer is a cutting-edge wireless smart probe designed for precise measurement of air velocity, in-duct airflow, and temperature. With its extendable telescopic shaft, Bluetooth connectivity, and user-friendly Smart Probe App, this lightweight device is perfect for HVAC professionals seeking efficiency and accuracy in their work.