Drip stick gage

A type of visual fuel-quantity indicator used on large aircraft to measure the amount of fuel in a tank. The drip stick, which is normally locked in the tank in its up position, is unlocked and slowly pulled down from the bottom of the tank. The bottom of the drip stick is watched until the first drips of fuel come from it. At this point, the top of the drip stick is level with the top of the fuel in the tank. Marks on the outside of the drip stick at the point it leaves the tank show the amount of fuel in the tank.