Used for ambient temperature, humidity, dew point temperature, wet bulb temperature, wind speed, and air volume. Large-screen LCD and backlight. Data Hold. Auto Power OFF. USB real time data uploading functions. Air Velocity : m/s (meter/Second) , km/h (kilometers/Hour) , Ft/sec (Feet/second), Knots(Nautical MPH) , mil/h (Mil /Hour) , ft/m (Feet/Minute). Air Flow : CMM(m³/min) , CFM(ft³/min) , CMS.