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Borosilicate glass, bulb form, with one mark. Accuracy as per Class B. As per DIN ISO 648 standard. Blue Graduation Capacity 1 ml, Tolerance ±0.015 ml. BURETTE HOLDER NOT INCLUDED Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.