The Thies Compact: 4.3129.70.701 is a wind vane sensor manufactured by Thies. A wind vane, also known as a weather vane, is a device that is used to measure the direction of the wind. It consists of a shaft with a fin or vane attached to the top, which aligns itself with the wind direction, and a sensor at the base that detects the rotation of the shaft and converts it into an electrical signal that can be read by a weather station or other monitoring system. The Thies Compact: 4.3129.70.701 is a compact and lightweight wind vane sensor that is designed for use in a variety of applications. It’s suitable for both indoor and outdoor use, providing reliable measurements of wind direction even in harsh weather conditions.