Cylinder Measuring Graduated, cap. 25ml., class 'B', Hex. base with spout, borosilicate glass, Blue Graduation-EIS-CH0345A offers a thoughtfully designed, durable resource for hands-on learning. 25ml graduated measuring cylinder made of high quality, heavy duty Borosilicate 3.3 glass. Spout for easy pouring, and hexagonal base for extra stability. Class B tolerance, ±0.50ml as per DIN EN ISO 4788 standard. Blue printed graduations and specifications. 0.5ml subdivisions. Cylinder stands 6.75" tall, with a base measuring 2.1" wide. Inner diameter of cylinder body measures 18.5mm (0.7"), and outer diameter measures 22mm (0.9"). 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. Calibrated to contain.