Borosil Reusable Class A Volumetric Pipettes are with One Mark for accurate measurement and decanting of liquid. Calibrated for delivery(TD). Each pipette is individually calibrated by automatic, laser-controlled calibration equipment. Manufactured with sturdy, consistent wall thickness. Reusable. Uniform inner bore diameter for smooth flow. Beveled tips resist chipping. Pipettes can be autoclaved and, if necessary, flame-sterilized. Borosil Volumetric Pipettes are graduated for delivery from the capacity mark to the tip, without "blowing out" the droplet remaining in the tip after dispensing. Borosil Class A Volumetric Pipettes comply with ASTM E-969-02. Available in sizes ranging from 1mL to 100mL. 1. 5mL and 2. 5mL options are not covered by ASTM standards. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices.