The Digi-Sense 20250-14 CFM/CMM Vane ThermoAnemometer is designed for precision air velocity and airflow measurements in seven user-selectable units of measurement (ft/min, m/s, mph, km/h, knots, CFM, and CMM). The 2025014 will help you meet cooling and environmental requirements for safety and comfort. The large dual display allows you to simultaneously read air velocity or airflow, and air temperature (°F/°C).