Pipette having an axially relocatable control button, a pressure sensor,
which is integrated into the control button, a lifting rod, coupled with
the control button and having a stopping bead, a hollow driving spindle,
accommodating the lifting rod and being axially relocatable, a twisting
lock, preventing the driving spindle from being twisted, a turnable
driving nut having screw thread engagement with the driving spindle, an
axial support of the driving nut, an electric driving motor with a motor
shaft, a gear between the motor shaft and the driving nut, an electric
power supply, an electric control system, connected to the pressure
sensor, the electric driving motor and the electric power supply, which
provides an electric voltage to the electric driving motor upon a push on
the control button which is indicated by the pressure sensor, so that the
motor relocates the driving spindle via the gear in the direction of a
relocation of the control button by the push, the driving spindle taking
the lifting rod along with it on its stopping bead, a plunger, coaxially
displaceable with respect to the lifting rod, a cylinder, connected to an
opening which leads outward and in which the plunger is sealingly guided,
and a plunger spring loading the plunger in the direction of an end of
the lifting rod.