Borosil Reusable Class A Serological Pipettes are graduated using a permanent amber treatment that will not wear off even after reuse. Each pipette is individually calibrated by automatic, laser-controlled calibration equipment. Manufactured with consistent wall thickness. Reusable. Uniform inner bore diameter for accuracy between different readings. Beveled tips resist chipping. Pipettes can be autoclaved and, if necessary, flame-sterilized. Borosil Serological Pipettes are graduated for delivery from the zero mark to the tip, without "blowing out" the droplet remaining in the tip. Borosil Class A Serological Pipettes comply with ASTM 1293-02. Available from 1mL to 25mL. 1mL size available in two different graduation intervals (0. 01mL and 0. 1mL). 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.