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 • Inscribed with individual serial number for tracibility to National Standards. • Graduations in white enamel • Manufactured from chemically resistant borosilicate glass with hexagonal foot Legal Information PYREX is a registered trademark of Corning, Inc.