Borosil® Reusable Class A Volumetric Pipettes are w/ One Mark for accurate measurement & decanting of liquid. Calibrated for delivery(TD). Each pipette is individually calibrated by automatic, laser-controlled calibration equipment. Manuf.w/ 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 w/ ASTM E-969-02. Avail. in sizes ranging from 1mL to 100mL. 1.5mL & 2.5mL options are not covered by ASTM standards. Manuf.from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, & reliability at competitive prices.