The Kanomax Climomaster Straight Air Velocity Probe 6551-21 enables the Climomaster Hot Wire Anemometer to measure air velocity from 20 to 6000 fpm. This air velocity probe is a miniature sphere and therefore omni-directional, capable of taking accurate air velocity measurements despite its orientation. The probe cable on the 6551-2G measures about 1 meter (3.28 feet) in length.