The 6533 Wind speed and direction instrument is a high performance RM young sensor. It combines simplicity and lightweight corrosion resistant construction with a low threshold, fast response, and excellent fidelity.
Specification

WIND SPEED
Range: 0 … 100 m/s (224mph)
Accuracy: ±0.3% or 1% of reading
Threshold: Propeller 1.0m/s (2.2mph)
Output Signal: 8 or 16 bit counter channel, 3 pulses per revolution
WIND DIRECTION
Azimuth: 0 … 360° mechanical, 355° electrical (5° open)
Accuracy: ±3°
Threshold: Vane 1.1m/s (2.4mph)