Nalgene™ graduated cylinder. No meniscus to confuse readings. Large blue base prevents tipping. All sizes have generous pour spout and are molded in translucent polypropylene. Molded-in large, easy-to-read graduations. Can be chemically sterilized without affecting accuracy. Can be autoclaved, but accuracy will be affected. Guaranteed to meet accuracy requirements of ASTM Class B, E1272, "Cylinder, Graduated, Laboratory, Glass" and all requirements of ISO Standard 6706 "Plastic Laboratory Ware-Graduated Measuring Cylinders." Meets requirements of CFR 21, Part 177.1520.