Wind chill indication and Beaufort scale. -Five Units of Air Velocity: m/s, Km/h, ft/min, Knots, mph. Air Velocity Specification Range:0 - 30 m/s, 0 - 90 km/h, 0 - 5860 ft/min, 0 - 65 mph, 0 - 55 Knots.
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