Air data calibration measures the air mass surrounding aircraft. The 2 main charcteristics that aare measured are pressure and temperature., and acquired through various sensors.
An air data test set provides an aircraft information on altitude, airspeed and vertical speed. It is consists of a pressure generator, sensor and display unit.
Air Data test sets can train aircraft maintenance technicians on calibration techniques as well as research and development purposes. These are commonly used for the testing of pilot-satic ssytems, avionics and identifying leak detection.