4-in-1 multi-function meter... anemometer, humidity meter, light meter and type-K digital thermometer. Air Velocity Ranges/Resolution: m/s: 0.4 to 30.0 m/s / 0.1 m/s; km/h: 1.4 to 108.0 km/h / 0.1 km/h; mph: 0.9 to 67.0 mph / 0.1 mph; knots: 0.8 to 58.3 knots / 0.1 knot; ft/min: 80 to 5910ft/min / 1ft/min. Includes battery.