Pyrex® pipettes, Class A color-coded reusable 50 mL volume
 
 
Sigma-Aldrich
General description Tempered top and tip. Red graduation and markings, color-coded, ASTM E 969. Other Notes Manufactured to Class A tolerances as established by ASTM E 694 for volumetric testing and ASTM E 542 for calibration of volumetric ware. Legal Information PYREX is a registered trademark of Corning, Inc.