Corning® Pyrex® graduated cylinders calibrated "to deliver" in accordance with ASTM E-1272 and ASTM E-542. Each cylinder is individually serialized and supplied with a Certificate of Identification and Capacity, traceable to NIST standards. Permanent white graduations are easy to read. Bumper guards are supplied with 25mL through 2000mL inclusive. The 10mL size has a funnel top. Nonsterile. Reusable.