A pipette for actuating a syringe, having • a rod-shaped housing, • a first seat with a first opening at the lower end of the housing for inserting a first fastening section at the upper edge of a cylinder of the syringe, • a seat body with a second seat and a second opening at the lower end in the housing for inserting a second fastening section on a plunger of the syringe, • first means for releasably holding the first fastening section in the first seat, • second means for releasably holding the second fastening section in the second seat, • first means for displacing the seat body in the housing away from the first seat, • second means for displacing (28, 36, 39) the seat body toward the first seat in steps with a step width corresponding to the volumes of fluid to be ejected from the syringe with the steps, • an actuating element that can be actuated outside of the housing for performing individual steps, • a toothed rack, having a toothing in the housing, connected to the seat body, • a pawl, mounted pivotably on the actuating element in the housing, which during downward displacing of the actuating element comes into engagement with the toothing of the toothed rack and takes it along, and during upward displacing of the actuating element disengages from the toothing, • an adjusting element that can be adjusted outside of the housing for adjusting the step width of the steps, • a covering, arranged displaceably on the toothed rack on the side of the pawl, having a restraining surface facing toward the pawl for restraining the pawl from engaging in the toothing and having a descension edge at the lower end, beneath which the toothing is exposed for the engagement by the pawl, • a coupling element, arranged on the covering, which is coupled to the adjusting element, in order to transmit an adjustment of the adjusting element to the covering, • wherein the covering has a first covering part, on which the coupling element is arranged, and a second covering part, on which the descension edge is formed, the relative positioning of which to each other can be adjusted in the longitudinal direction of the toothed rack, and • means for positioning, arranged on the covering, which determine an adjusted position of the first and the second covering part (42, 60) relative to each other. • a rod-shaped housing, • a first seat with a first opening at the lower end of the housing for inserting a first fastening section at the upper edge of a cylinder of the syringe, • a seat body with a second seat and a second opening at the lower end in the housing for inserting a second fastening section on a plunger of the syringe, • first means for releasably holding the first fastening section in the first seat, • second means for releasably holding the second fastening section in the second seat, • first means for displacing the seat body in the housing away from the first seat, • second means for displacing (28, 36, 39) the seat body toward the first seat in steps with a step width corresponding to the volumes of fluid to be ejected from the syringe with the steps, • an actuating element that can be actuated outside of the housing for performing individual steps, • a toothed rack, having a toothing in the housing, connected to the seat body, • a pawl, mounted pivotably on the actuating element in the housing, which during downward displacing of the actuating element comes into engagement with the toothing of the toothed rack and takes it along, and during upward displacing of the actuating element disengages from the toothing, • an adjusting element that can be adjusted outside of the housing for adjusting the step width of the steps, • a covering, arranged displaceably on the toothed rack on the side of the pawl, having a restraining surface facing toward the pawl for restraining the pawl from engaging in the toothing and having a descension edge at the lower end, beneath which the toothing is exposed for the engagement by the pawl, • a coupling element, arranged on the covering, which is coupled to the adjusting element, in order to transmit an adjustment of the adjusting element to the covering, • wherein the covering has a first covering part, on which the coupling element is arranged, and a second covering part, on which the descension edge is formed, the relative positioning of which to each other can be adjusted in the longitudinal direction of the toothed rack, and • means for positioning, arranged on the covering, which determine an adjusted position of the first and the second covering part (42, 60) relative to each other.