BURRETTE

A burette (also buret) is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a precision tap, or stopcock, on the bottom.
It is used to dispense known amounts of a liquid reagent in experiments for which such precision is necessary,
such as a titration 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