Lightweight anemometer is an ultra compact digital anemometer designed for fast and accurate wind speed readings on site. It is built around high response micro motors or ultrasonic sensors (depending on the model),Designed for measuring low-speed airflow (starting from 0.3 m/s) with laboratory grade accuracy. Very suitable for HVAC debugging, drone pre flight inspection, navigation, greenhouse ventilation, and any important application of "breeze" (Puff 0-2).Application: Conduct rapid spot checks on meteorological stations and drone launches; Spray drift assessment and microclimate research; Monitoring of outdoor fire behavior; Balance the surface velocity of ventilation ducts and fume hoods in HVAC systems; Outdoor activities such as sailing, drone races, and paragliding.