What device measures indicated airspeed and relies on the pitot tube for information?

The airspeed indicator is the device that measures indicated airspeed by utilizing data from the pitot tube. The pitot tube is an essential component that captures dynamic pressure from the airflow as the aircraft moves through the air. This dynamic pressure, combined with static pressure readings, allows the airspeed indicator to compute and display the speed of the aircraft relative to the surrounding air.

The vertical speed indicator, altimeter, and ground speed indicator serve different functions. The vertical speed indicator measures the rate of climb or descent, and it relies on static pressure rather than the dynamic pressure the pitot tube provides. The altimeter measures altitude, again using static pressure to determine the height above sea level. The ground speed indicator, on the other hand, calculates the speed of the aircraft over the ground, which is influenced by wind conditions and does not use the pitot tube for information. Therefore, the airspeed indicator is the correct choice as it specifically measures airspeed by relying on the data from the pitot tube.