Amprobe TMA5 Mini Vane Anemometer Pocket size, compact design Measures: air velocity, temperature, humidity, dew point, wet bulb, wind-chill and ambient temperature Selectable wind units: KNT (Knot), BF (Beaufort), ft/m (feet per minute), M/h (mile per hour), m/s (meter per second), km/h (kilometer per hour) Selectable temperature units °C or °F Max wind speed display Quick measurement response External temperature probe Easy, two-button operation Data hold Auto power off with disable feature Low battery indication Ergonomic design with a wrist strap