Rotaflow Stopcock

A burette is a vertical cylindrical piece of laboratory glassware with a volumetric graduation etched permanently on its full length and a precision tap, or stopcock with plug and bore, on the bottom. The commonly used stopcocks can be a ground-glass barrel or a plastic plug made of Teflon depending on the liquid to be carried. It is used to dispense known amounts of a liquid reagent in experiments for which such precision is necessary, such as in a volumetric analysis. Burettes are extremely accurate, and have very small accuracy tolerances. Delivery time of this Burette is 60 sec. to 90 sec.