Testo 410i Vane Anemometer Smart Probe (0560 1410) The Testo 410i is a Bluetooth vane anemometer smart probe that measures air velocity, airflow and temperature, and pairs wirelessly with the free Testo Smart App on iOS or Android. Small enough to fit in a shirt pocket at 154 x 43 x 21 mm and 117.8g, it turns a smartphone into the display, data logger and reporting tool for airflow measurement work. Velocity is measured across a range of 0.4 to 30 m/s with 0.1 m/s resolution, covering both residential and commercial HVAC applications. Temperature is measured simultaneously from -20°C to +60°C with ±0.5°C accuracy, so a separate thermometer isn't needed. The instrument itself is rated for operation between -20°C and +50°C. For balancing work, the app can calculate timed or multi-point mean airflow automatically, and once outlet dimension