From CHATgpt:
Pilot tubes are devices used in aircraft to measure the dynamic pressure of the surrounding air. Air speed is determined by measuring the difference between the total pressure and the static pressure of the air, both of which are measured using the pilot tube.
The pilot tube is a small tube that is mounted on the aircraft’s surface, typically on the leading edge of the wing or the fuselage. It has a small opening on the front end that is exposed to the oncoming airflow, and a series of pressure ports on the sides that are connected to a pressure-sensing device inside the cockpit.
As the aircraft moves through the air, the oncoming airflow enters the pilot tube and creates a dynamic pressure inside it. This pressure is higher than the static pressure of the surrounding air, which is why the side ports of the tube measure a difference in pressure. By subtracting the static pressure from the total pressure, the airspeed of the aircraft can be calculated.
The resulting measurement is usually displayed on a gauge or instrument panel in the cockpit, which shows the pilot the current airspeed of the aircraft. The accuracy of the measurement depends on the design and calibration of the pilot tube and the associated instrumentation.
pitot tubes (note the spelling)