This is the Airspeed MicroSensor V3 from Eagle Tree Systems. FEATURES: Uses a Prandtl style pitot-static tube to measure airspeed Can be connected to the eLogger to provide airspeed data for your entire flight Advanced temperature compensation and calibration ensures accuracy INCLUDES: One Airspeed MicroSensor V3 with instruction sheet REQUIRES: Installation on the airplane cnh 11/13/08 ir/jxs