TaylorŪ Windscope Speed and Direction Indicator Measures wind speed and direction on one instrument. Double scale for easier reading: 0-30 mph/0-48 km/hr (low wind) and 0-120 mph/0-190 km/hr (high wind). No battery drain except when reading direction. Indicator can be mounted on wall or placed on a desk. Outdoor measuring unit can be located up to 2,000 feet away. Corrosion-resistant, rugged, and easy to maintain outdoor unit. Includes battery, 60 ft. electrical cable, and instructions. Resolution: 1 mph/2 km/hr (low wind);5 mph/10 km/hr (high wind). Dimensions: 6-1/2" x 5".