This portable wind speed indicator can be held easily in one hand. The pointer returns to 0 after 30 seconds after which a lever at the bottom of the dial is pulled. The pointer will stop on the value indicating the mean wind velocity in a period of 30 seconds. No power supply is required for use. Velocity range is from 0 to 22 m/s. The dial is 100 mm in diameter and the instrument is 300 mm in length.