Dual LCD screen simultaneously displays air velocity and temperature. This compact air velocity meter (anemometer) measures in fpm m/s kph mph and knots. The R1900 keeps track of maximum and average readings and features a data hold function and low friction rotating vane for improved accuracy. • Measures fpm m/s kph mph knots and temperature. • Designed for one-handed operation. • Backlit dual LCD display. • Beaufort wind force scale. • Max average and data hold functions. • Low battery indicator and auto shut off. • Sold as 1 Each.