The "volumetric" or "transfer" pipette measure a particular volume to high accuracy. (The three pipettes at the top of Figure 1 are volumetric pipettes designed to deliver 25, 20 and 10 mL, respectively.) Volumetric pipettes are designed such after a fluid is dispensed, a small drop of liquid will remain in the tip.
Similarly, you may ask, what is the use of a pipette?
A pipette (sometimes spelled pipet) is a laboratory tool commonly used in chemistry, biology and medicine to transport a measured volume of liquid, often as a media dispenser. Measurement accuracy varies greatly depending on the style.
How does the pipette work?
The liquid, in contrast, is taken up into a disposable pipette tip and then dispensed. The piston moves the air cushion and the liquid is thus taken up into the pipette tip or dispensed out of it. The air cushion thus works like an elas- tic spring, to which the liquid sticks.