Description General description • Complies with ISO 4788 • Calibrated to Class A tolerances • Individually tested and supplied with certificate showing exact volume contained at 5 points on the scale • Conformity ′H′ certified • Printed with individual serial number for batch certification • Manufactured from chemically resistant Pyrex borosilicate glass with hexagonal glass • Graduations in white enamel for improved visibility with dark coloured solutions • Supplied with polyethylene stopper Legal Information PYREX is a registered trademark of Corning, Inc.