Graduated Cylinder, 250mL - Class B - 24/29 Polypropylene Stopper - Hexagonal Base - Blue Graduations - Borosilicate Glass

This 250mL measuring cylinder is made from heavy duty borosilicate 3.3 glass and meets Class B accuracy under ISO and ASTM standards, with a tolerance of ±2.00mL. Blue printed graduations are numbered every 20mL, and the cylinder is calibrated to contain rather than to deliver. The cylinder stands 14 inches tall with a body outer diameter of 1.6 inches, on a hexagonal base measuring 3.75 inches across. An interchangeable 24/29 polypropylene stopper closes the cylinder between steps. The narrow body relative to capacity supports the stated tolerance, since a small error in judging the meniscus corresponds to a small volume error in a narrow bore. Borosilicate 3.3 glass resists thermal shock and is autoclavable, with chemical durability across acids, bases, and organic solvents.