GENERAL DCFM8906 Thermo Anemometer, 80 to 6900 fpm. More details: Anemometer, Rotating Vane and Thermistor Sensing Method, Data Logging No, Humidity Sensing No, Velocity (FPM) 80 to 6900, Velocity (MPS) 0.4 to 30, Air Velocity Accuracy +/-3 Percent Full Scale, Air Volume 0 to 99, 999 cfm, Temp. Range 14 Degrees to 122 Degrees F, Probe Size 2.80 In. dia., Data Hold Yes, Auto Power Off Yes, Interface RS-232, Includes Battery, Hard Carrying Case and Instructions