This top-of-the-line ground speed sensor delivers the truest velocity measurement available at mounting heights over 6 feet. Velocity range 0.33-66 mph (0.53-96.6 km/h). Variety of factory output frequency settings available. Sleek design—4 x 4 x 12.25 in. (10 x 10 x 31.1 mm). Weighs only 4.5 lbs. (2.05 kg) Achieves velocity errors of ±1-3% through in-field calibration.