Bulb form Pipette made of high quality borosilicate glass Class B, DIN ISO 648 Standard 25ml capacity Color Code: Blue Measures 20.5" tall. Pipette diameter measures 0.2", bulb diameter measures 0.8". Class B, 25ml bulb form pipette, made of high quality borosilicate glass. Ideal for pipetting liquid substances from one vessel to another with accuracy. As per DIN ISO 648 standard. Color code: Blue. Tolerance ±0.060 ml. Pipette measures 20.5" tall, and has a diameter of 0.20". Bulb diameter measures 0.8" Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.