Cylinder Measuring Graduated, cap. 50ml., class 'B', round base with spout, borosilicate glass, Blue Graduation-EIS-CH0344B offers a thoughtfully designed, durable resource for hands-on learning. 50ml graduated measuring cylinder made of high quality, heavy duty Borosilicate 3.3 glass. Spout for easy pouring, and round base for extra stability. Class B tolerance, ±1.00ml as per DIN EN ISO 4788 standard. Blue printed graduations and specifications. 1ml subdivisions. Cylinder stands 7.5" tall, with a base measuring 2" wide. Inner diameter of cylinder body measures 22mm (0.8"), and outer diameter measures 27mm (1"). 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.