Patent ID: 6910395

Claim:
A pipetting device for detachably mountable pipette tips, comprising: a moving device ( 7 ) a piston ( 8 ) movable by the moving device ( 7 ) in a cylinder ( 9 ) to displace a column of air, an attachment stem ( 3 ) for mounting a pipette tip ( 4 ), with an aperture having a connection ( 14 ) to the cylinder ( 9 ) at the free end, two stops ( 11 , 13 ) limiting the movement of the piston ( 8 ) during the displacement of the column of air, one of which is dislocatable, a precise adjustment device ( 6 ) for dislocating the dislocatable stop ( 11 ) in parallel with the piston ( 8 ) for a precise adjustment of the piston stroke, a coupling device ( 15 ) which puts the precise adjustment device ( 6 ) into function, when coupled, and puts it out of function, when uncoupled, a rough adjustment device ( 10 ) for dislocating the dislocatable stop ( 11 ) when the precise adjustment device ( 6 ) is uncoupled, for a rough adjustment of the piston stroke, and a measuring and indicating device ( 17 ) coupled to the dislocatable stop ( 11 ) for measuring the position set for the dislocatable stop ( 11 ) and indicating the proportioning volume that matches the piston stroke set.