A pipette for use with a pipette tip comprising: • a rod-shaped pipette housing, • a nipple on the lower end of the pipette housing for holding a pipette tip, which has means for the form-fit connection to a pipette tip, so that a pipette tip can be shoved onto the nipple while elastic constriction of the nipple and/or while elastically expanding the pipette tip before its form-fit connection with the nipple, • a drive apparatus to displace a displacement element for aspirating a liquid specimen into a pipette tip held on the nipple, and for ejecting the specimen from the pipette tip, • an ejection apparatus (18, 27, 39) comprising a curved support that is rotatably mounted in the pipette housing, a first sensing element on an ejection rod that is guided on a first curve on the perimeter of the curved support, said ejection rod being displaceably guided in the pipette housing in the longitudinal direction of the nipple, and an operating element connected to the curved support that projects from the pipette housing and can rotate relative to the pipette housing, wherein the ejection apparatus is designed to rotate the curved support out of a start position by rotating the operating element, wherein the first curve displaces the first sensing element downward so that the ejection rod presses a pipette tip held on the nipple off of the nipple, • a locking apparatus comprising a locking sleeve arranged concentric to the nipple and a control rod projecting upward from the locking sleeve are displaceably guided toward the nipple in the pipette housing, • while a second sensing element projects from the control rod, and the curved support has a second curve on the perimeter on which is guided the second sensing element which is designed so that, when the operating element is arranged in the start position, the locking sleeve borders the nipple on the inside when in a locked position, and/or borders the pipette tip on the outside, whereby the locking sleeve prevents a release from the nipple of a pipette tip connected in a form-fit to the nipple, and the locking sleeve is displaceable upward by rotating the operating element so that the nipple and/or the pipette tip is at least partially released, and the ejection rod pushes the pipette tip off of the nipple. • a rod-shaped pipette housing, • a nipple on the lower end of the pipette housing for holding a pipette tip, which has means for the form-fit connection to a pipette tip, so that a pipette tip can be shoved onto the nipple while elastic constriction of the nipple and/or while elastically expanding the pipette tip before its form-fit connection with the nipple, • a drive apparatus to displace a displacement element for aspirating a liquid specimen into a pipette tip held on the nipple, and for ejecting the specimen from the pipette tip, • an ejection apparatus (18, 27, 39) comprising a curved support that is rotatably mounted in the pipette housing, a first sensing element on an ejection rod that is guided on a first curve on the perimeter of the curved support, said ejection rod being displaceably guided in the pipette housing in the longitudinal direction of the nipple, and an operating element connected to the curved support that projects from the pipette housing and can rotate relative to the pipette housing, wherein the ejection apparatus is designed to rotate the curved support out of a start position by rotating the operating element, wherein the first curve displaces the first sensing element downward so that the ejection rod presses a pipette tip held on the nipple off of the nipple, • a locking apparatus comprising a locking sleeve arranged concentric to the nipple and a control rod projecting upward from the locking sleeve are displaceably guided toward the nipple in the pipette housing, • while a second sensing element projects from the control rod, and the curved support has a second curve on the perimeter on which is guided the second sensing element which is designed so that, when the operating element is arranged in the start position, the locking sleeve borders the nipple on the inside when in a locked position, and/or borders the pipette tip on the outside, whereby the locking sleeve prevents a release from the nipple of a pipette tip connected in a form-fit to the nipple, and the locking sleeve is displaceable upward by rotating the operating element so that the nipple and/or the pipette tip is at least partially released, and the ejection rod pushes the pipette tip off of the nipple.