Electronic pipette with a displacement device, an electric drive motor
with a drive shaft, a gear mechanism coupled on the one hand to the
displacement device and on the other hand to the drive shaft, a magnetic
disc rotationally coupled to the drive shaft with at least one magnetic
pole on the circumference, at least one magnetic sensor aligned with the
circumference of the magnetic disc, at least one additional magnet
aligned with the circumference of the magnetic disc, an electronic
control device electrically connected to the electric drive motor and the
magnetic sensor and an electric voltage supply connected to the
electronic control device.