The capacity tolerance on this 50mL Class A Corning Pyrex buret is established by ASTM E-287 and is calibrated in accordance with ASTM E-542 and D-511. The buret is individually serialized and supplied with a Certificate of Identification and Capacity, traceable to NIST standards. Tip is carefully drawn from accurate bore tubing to insure proper drainage rates. This buret has colored markings, fine, sharp lines and large easy-to-read numbers. The stopcock barrel has a smooth micro-finish to assure leak-resistant performance. Buret is supplied with a dust cover and a 2mm bore PTFEstopcock plug. Material: Borosilicate Glass Code 7740. Capacity: 50mL. Tolerance +/-: 0.05mL. Stopcock Style: Straight Bore Teflon. Stopcock Bore No.: 2. Height: 750mm (approx). Outer Diameter: 14mm (approx). Corning#: 2105-50.