The Turbo Meter provides uncommon accuracy, sensitivity, and pocket-sized convenience. A special three digit display is used for extra resolution and provides excellent viewing contrast in bright sunlight. A handy switch selects between four different scales: knots, feet per minute, meters per second, miles per hour. Unit is compact (2.6" x 4.7") and lightweight (3 oz.). Measures wind speed from 0-99.9 mph.