Dynamic pressure is typically measured using a pitot-static tube, which is accurate over a wind yaw angle range of around +/-10°.
The 3-hole probe is a type of pitot tube which also measures yaw angle. However, this has a very complicated calibration due to separation of the flow from the probe head. As a results we found it to give poor results across the large speed and yaw angle range that bicycles operate at.
Our patented probe design maintains clean attached flow through the probe central channel, giving a very linear and easily-calibrated response across a large yaw angle range.