Burette with 100ml capacity Class A, with ± 0.10mL tolerance and 0.20mL sub. divisions - Accurate as per class A, DIN ISO 385 Compliant Includes an attached key stopcock made of high quality glass Burette is made of precisely bore high quality, heavy duty Borosilicate 3.3 glass - Built to last Features chemical resistant blue printing - All contents are included in a single package Class A, Accuracy as per DIN ISO 385 standard. Burette is made of high quality 3.3 borosilicate glass. Glass key stopcock. Capacity 100ml Sub. Div. 0.20mL Tolerance ± 0.10mL Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point 515°C | Annealing Point 565°C | Softening Point 820°C. Calibrated for delivery.