Anemometer, Rotating Vane and Thermistor Sensing Method, Data Logging No, Humidity Sensing Yes, Velocity (FPM) 99 to 3,937 fpm, Velocity (MPS) 0.5 to 20 mps, Air Velocity Accuracy +/-3 Percent of Reading +39 fpm, Case Color Black, Air Volume 0 to 99,999 cfm, Temp. Range -4 Degrees to 140 Degrees F (-20 Degrees to 60 Degrees C), Relative Humidity Range 0 Percent to 99.9 Percent, Probe Size 2.83 in dia, Cord Length 3.9 ft, Data Hold Yes, Auto Power Off Yes