STORM’s Fecheimer probe is ideal for testing in locations with turbulent airflow such as test planes close to fans or internal bracing, bends in the duct work and more. The Fecheimer Probe is a three-hole probe with one impact hole and two static holes. This allows the probe to be null balanced to determine the yaw angle of flow and to correct the velocity head. They are manufactured in 2ft intervals from 6ft to 20ft, however custom sizes are available.