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This 500mL Corning Pyrex graduated buret is suitable for use in school and institutional laboratories not requiring the accuracy of our Class A model. Buret is used for dispensing large volumes of liquids rapidly and accurately. Made from close tolerance, accurate bore tubing with uniform walls, this buret has a permanently colored scale. Equipped with a PTFEstopcock plug to reduce freezing and eliminate lubricant contamination. The smooth micro-finish of the stopcock barrel assures a precision fit and optimum leak-resistant performance. Material: Borosilicate Glass Code 7740. Capacity: 500mL. Tolerance +/-: 2.5mL. Stopcock Style: Straight Bore Teflon. Stopcock Bore No.: 4. Height: 675mm (approx). Outer Diameter: 41mm (approx). Corning #: 2094-500.