No more surprises with the Testo 405i Thermal Anemometer Smart Probe. Designed for professionals, this anemometer from the Testo Smart Probes series is perfect for measuring air velocity, temperature, and volume flows in ventilation ducts. It’s also ideal for checking indoor air velocity, locating non-airtight windows, and calculating cooling capacities and heating outputs when paired with the Testo 605i thermohygrometer. Key Features: Versatile Measurements: Accurately measures air velocity, temperature, and volume flows. Indoor Air Velocity: Perfect for locating non-airtight windows and ensuring optimal indoor air quality. Cooling and Heating Calculations: Works with Testo 605i thermohygrometer for com