Range: 0 - 30 m/s, 0 - 90 km/h, 0 - 5860 ft/min, 0 - 65 mph, 0 - 55 Knots * Resolution: 0.1 m/s, 0.3 km/h, 19 ft/min, 0.2 mph, 0.2 Knots * LED back light design for operation under poor illumination * Ideal tool for windsurfing, sailing, fishing, kite flying and mountaineering * Five Units of Air Velocity: m/s, Km/h, ft/min, Knots, mph