Glass Stopcock

Burettes are usually made of glass and contain many markings, called graduations. Burettes are used to measure and dispense liquid volumes accurately. Usually each major division is marked with a number, and the reader must count the number of graduations present between each major division. Simple division reveals the volume represented by each mark on the cylinder. For instance, if the major divisions are 10mL, 20mL, 30mL, etc., and there are ten graduations in between each of those divisions, then each line represents 1mL (10mL ÷ 10 divisions = 1mL/division). Delivery time of Burette is 60 sec. to 90 sec.