Davis Instruments Wind Wizard Info Found On-Line- Mechanical wind speed indicator The Wind Wizard is a rugged precision instrument. Its direct-reading dial features sapphire jewel bearings and a gold-plated balance spring. A special magnetic damping system uses two rare earth magnets to steady the dial card, greatly reducing the tendency of the readout to jump around. High impact plastic case, and all metal used is corrosion-resistant. Light weight and folds to pocket-size; battery-free operation Displays wind speed in mph, meters/second and Beaufort scale Compact instrument accurately measures wind speed from 0-60mph (0-28 meters/sec.) Dimensions: 3.6" x 2.9" x 1.0" (9 x 7 x 3cm) with handle folded