The pipette is also called the pipette gun, which is a measuring tool to transfer liquid from the original container to another container within a certain range. It is widely used in biology, chemistry and other fields. Pipettes are widely used in clinical laboratories because of their simple basic structure and convenient use. Its basic structure mainly includes several parts such as display window, volume adjustment parts, piston, O-ring, suction tube and suction head (suction nozzle).