100mL capacity Schellbach Burette has a vertical white backing with a central blue line opposite the graduations, providing better contrast with the miniscus Made of high quality, heavy duty, borosilicate 3.3 glass. Autclavable, with excellent durability and chemical resistance Conforms with Class B, DIN ISO 385 standards, with 0.2mL graduations and ±0.20mL tolerance - Calibrated to deliver Chemical-resistant white markings and graduations provide contrast against dark liquids Includes an attached glass key stopcock This 100mL capacity Schellbach Burette is made of high-quality, heavy-duty borosilicate 3.3 glass - built to last. A white backing with a central white line runs the outside length of the tube opposite the graduations, so the meniscus is clearly visualized. Features a straight bore, glass stopcock and white markings which provide excellent contrast against dark liquids. Accurate to Class B, DIN ISO 385 standards with 0.2mL graduations and ±0.20mL tolerance. Calibrated to deliver. Burette measures 31.75" long with a 19mm (0.7") outer diameter. Autoclavable, with superior chemical durability. Low temperature gradient- can withstand high temperatures & thermal shocks. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point 515°C | Annealing Point 565°C | Softening Point 820°C.