Most aircraft have these six basic flight instruments: Image:3-Pointer Altimeter.svg Altimeter : Gives the aircraft's height (usually in feet or meters) above some reference level (usually sea-level) by measuring the local air pressure. It is adjustable for local barometric pressure (referenced to sea level) which must be set correctly to obtain accurate altitude readings. Image:VMS Artificial Horizon.jpg Attitude indicator (also known as an artificial horizon) : Shows the aircraft's attitude relative to the horizon. From this the pilot can tell whether the wings are level and if the aircraft nose is pointing above or below the horizon. This is a primary instrument for instrument flight and is also useful in conditions of poor visibility. Pilots are trained to use other instruments in c