Pipette

The utility model discloses a pipettor. The pipettor comprises a fixed shell, a movable piston component, a first magnetic sensor and a first magnet, one end of the fixed shell is used for being in butt joint with a pipetting channel of a pipetting gun head in a sealed mode, and a moving channel communicated with the pipetting channel is formed in the fixed shell. The movable piston component is movably sleeved with the moving channel in the extending direction of the moving channel so as to transfer liquid. One of the first magnetic sensor and the first magnet is arranged on the fixed shell, and the other one of the first magnetic sensor and the first magnet is arranged on the movable piston component to synchronously move along with the movement of the movable piston component, so that the magnetic field intensity sensed by the first magnetic sensor is changed, and the first magnetic sensor moves along with the movable piston component to form a corresponding sensing signal. The induction signal generated b