A pipette or dropper is a laboratory tool commonly used in
chemistry,
biology and
medicine to transport a measured volume of liquid, often as a
media dispenser. Pipettes come in several designs for various purposes with differing levels of
accuracy and precision, from single piece glass pipettes to more complex adjustable or electronic pipettes. Many pipette types work by creating a partial
vacuum above the liquid-holding chamber and selectively releasing this vacuum to draw up and dispense liquid. Measurement accuracy varies greatly depending on the style.