- IMPORTANT NOTE: This wind sensor fan is designed to work exclusively with the BT-856A and BT-846A anemometers for accurate measurements. The anemometer is not included. - [Original Air Flow Sensor]: This replacement USB wind sensor seamlessly connects to your BT-846A or BT-856A Pro HVAC CFM meter. Simply plug it into the main unit, and you're ready to start measuring airflow. - [Low Friction Impeller]: The low friction impeller allows for precise detection of low wind speeds, starting from 0.001 mph, ensuring you receive accurate readings even under minimal airflow conditions. - [Wide Measurement Range]: This sensor offers a wind speed measurement range from 0.001 to 100 mph, with an accuracy of +/- 3% and a resolution of 0.001 mph. It also measures air temperature from 32.0 to 113.0 ℉ (0 to 45℃) with a resolution of 0.1 ℉. - Practical Applications: - Ideal for HVAC professionals needing to measure and optimize air flow in residential or commercial settings. - Useful for environmental monitoring, helping you assess wind conditions for research or outdoor activities. - Suitable for home users wanting to evaluate ventilation systems or draftiness to improve energy efficiency. This wind sensor fan combines functionality and precision, making it an essential tool for accurate airflow measurements in various applications.