Corning® Pyrex® Class A graduated cylinders are calibrated "to deliver" in accordance with ASTM E-1272 and ASTM E-542. The double scale, numbered both up and down, is in durable white (Cat.No. 1-3023 series) or blue (Cat.No. 1-3026 series) enamel. Cylinders are supplied with shock absorbing polyethylene bumper guards. Nonsterile. Reusable.