Burette

A burette (also buret) is a vertical cylindrical piece of with a volumetric graduation on its full length and a precision tap, or , on the bottom. It is used to dispense known amounts of a in for which such is necessary, such as a experiment. Burettes are extremely accurate - a 50 cm3 burette has a tolerance of 0.1 cm3 (class B) or 0.06 cm3 (class A).

Burettes measure from the top since they are used to measure liquids dispensed out the bottom. The difference between starting and final volume is the amount dispensed