Air speed sensor which enables it to register extremely accurate airspeed readings. This sensor does not suffer from noise caused by long cables or from offsets caused by ratio-metric outputs which older analog airspeed systems suffer from.
Specifications:
A modified version of the airspeed head adopts digital differential pressure sensor
I2C communication
Suitable for PIXHAWK
Adoting PX4 ORIGINAL FIRMWARE
http://ardupilot.org/plane/docs/airspeed.html