Dipstick
A Peilstock is a measuring rod, with which the water depth can be determined, whether the water level in a tank (for example, when. Brewing ), the water level in the bilge of a ship or - in shallow waters - the height of water above the water bottom . It is a wooden or aluminum stick up to five meters long with a scale mark on it. On ships, a boat hook is often used as a dipstick or plumb stick.