GENERAL HWA4214SD Thermo Anemometer, 40 to 3940 fpm. More details: Anemometer, Hot Wire Sensing Method, Data Logging Yes, Humidity Sensing Yes, Velocity (FPM) 40 to 3940, Velocity (MPS) 0.2 to 25, Velocity (MPH) 0.5 to 44.7, Velocity (KPH) 0.7 to 172, Velocity (Knots) 0.4 to 38.8, Air Velocity Accuracy +/-5 Percent, Air Volume N/A, Temp. Range 32 Degrees to 122 Degrees F, Relative Humidity Range 0 to 85 Percent, Probe Size 0.47 In. dia. x 11.02 In. Collapsed, 37 In. Extended, Data Hold Yes, Auto Power Off Yes, Interface SD Card, Storage Capacity 2 GB