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A pipette (also called a pipet) is a laboratory instrument used to transport a measured volume of liquid. Pipettes are commonly used in chemistry and molecular biology research as well as medical tests. Pipettes come in several designs for various purposes with differing levels of accuracy and precision, from single piece flexible plastic transfer pipettes to more complex adjustable pipettes. A pipette works by creating a vacuum above the liquid-holding chamber and selectively releasing this vacuum to draw and dispense liquid.

Pipettes that dispense between 1 and 1000 μl are termed micropipettes, while macropipettes dispense a greater volume of liquid. Search Locally by State or Zip Code.

Adjustable pipettes

These are the most accurate and precise pipette designs. They operate by piston-driven air displacement. The vacuum is generated by the vertical travel of a metal piston within an airtight sleeve. As the piston moves upward, driven by the depression of the plunger, a vacuum is created in the space left vacant by the piston. Air from the tip rises to fill the space left vacant, and the tip air is then replaced by the liquid, which is drawn up into the tip and thus available for transport and dispensing elsewhere.

Sterile technique prohibits any liquid from coming into contact with the pipette. Calibration Test Equipment - Calibration - Tru Cal International.