High quality Borosilicate Glass 10mL capacity, 0.05mL graduations Glass Key Stopcock 17" tall, 0.5" diameter Class B, DIN ISO 386 Standard This Burette is made of high quality 3.3 Borosilicate glass with a glass key stopcock. Class B, accuracy as per DIN ISO 385 standard. Capacity 10ml with 0.05 graduations. 17" long, 0.5" diameter Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C. Calibrated for delivery. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.