Features: Lightweight and compact, easy to carry with, convenient to opearate. Real-time monitoring, come with low battery reminder, auto power off. Six kinds of units to choose, according to different measurement need to switch units. Mulifunctional, can be used to detect wind speed, wind temperature, air volume measurement. Eight leaves fan and imported bearing sensor, short response, strong anti-interference ability, more accurate data acquisition. Specifications: Material: Plastics, Electronic Component Display: LED-Display Display Value: 9999 0.4-30.00ms(Range), (2.0%+0.5ms)(Accuracy) 1.40-108kmh(Range), (2.0%+1.8kmh)(Accuracy) 1.30-98.50fts(Range), (2.0%+1.6fts)(Accuracy) 78.00-5900ftm(Range), (2.0%+10ftm)(Accuracy) 0.80-58.30knots(Range), (2.0%+1.0knots)(Accuracy) 0.90-67.10mileh(Range), (2.0%+1.10mileh)(Accuracy) Sampling-time: About 0.5 Seconds Sensor: Impeller+Bearing Data Hold: Lock the Display Reading Working Environment: 0~40 C, Maximum-Relative Humidity 80%, Altitude