A Pasteur pipette, or Pasteur pipet, is a glass or plastic instrument used in laboratories or classrooms to transfer small quantities of liquids. While traditional dropping pipettes have a short dispensing end and a medium-sized point, Pasteur pipettes have a long chamber and a fine point for controlling the placement and quantity of liquid dispensed. A glass Pasteur pipette is chemically inert and can be sterilized for reuse. A Pasteur filter pipet has a small filter built into the tip to filter sediment or contaminants from the solution and prevent aerosol transfer. Questions to consider when selecting Pasteur pipettes for applications include what is the sample volume, does the pipette material need to be inert or chemically resistant, should the pipette be suitable for one-time use or reusable, and does the pipette need to be sterile or sterilizable?