Calibrated "to deliver" (TD) at 20°C, these borosilicate glass, color coded pipettes are fabricated to meet the requirements for accuracy, appearance, glass quality and calibration line accuracy. Reference: Volumetric, Class A ASTM E-969 *NOTE: LG-9350-136 cannot be manufactured to meet Class A specs Scientists rely on the expertise and artistic skills of Wilmad-LabGlass' engineers and glass specialists to manufacture NMR and EPR consumables and laboratory glassware of the highest quality. Used daily in academia, healthcare and chemical, petroleum and other industrial applications, Wilmad offers 7000+ items as part of their standard catalog as well as custom fabrication for individual glassware, glass repair services and OEM glass parts.