A pipette with • a rod-shaped casing (1.1), • a seat for detachably holding a pipette tip on the lower end of the casing (1.1), • a displacement equipment, comprising a displacement chamber with a limit that is relocatable therein, • a connection channel, connecting the displacement chamber with an opening in the seat, • a drive equipment, coupled to the relocatable limit, for relocating the relocatable limit of the displacement chamber, • adjustable means (8, 25, 27) for limiting the relocation of the relocatable limit by the drive equipment, • an actuating element, connected to the drive equipment and projecting out from the upper end of the casing (1.1), for controlling a relocation of the relocatable limit by relocation along an axis, and for adjusting the adjustable means (8, 25, 27) for limiting by rotating the actuating element, • a cylindrical transmission part, which is rotatable in the casing (1.1) and bearing mounted at a certain position in the axial direction, wherein the actuating element is relocatable in an axially extending accommodation of the transmission part and is connected to the transmission part, so as to rotate together with it, via means (15, 16, 17, 18) for rotation-blocked connection, • first means (11, 14) for transmitting a rotational movement of the actuating element to a movement for adjusting the adjustable means for limiting (8, 25, 27) the relocation, coupled to the actuating element and the adjustable means for limiting (8, 25, 27) the relocation, • adjustable means for indicating a metering volume with a display that is visible from the outside, • second means (20, 21) for transmitting a rotational movement of the transmission part to a movement for adjusting the adjustable means for indicating, coupled to the transmission part and the adjustable means for indicating, • an annular circular cylindrical locking element on the outer circumference of the transmission part, • a locking body, which bears against the locking element in the locking position, • means for relocating the locking body into the locking position, • at least one unlocking element (106, 107), projecting from the casing (1.1) and being movably mounted with respect to the casing (1.1), • third means (92, 93) for transmitting a movement of the unlocking element (106, 107) with respect to the casing (1.1) to a movement, away from the locking element, of the locking body from out the locking position, the means (92, 93) being coupled to the locking body and the unlocking element (106, 107), characterized in that • the transmission part comprises the locking element on the outer circumference, • the locking body has a partly cylindrical acting surface, which bears against the circumference of the locking element in the locking position whereby the transmission part is held fast. • a rod-shaped casing (1.1), • a seat for detachably holding a pipette tip on the lower end of the casing (1.1), • a displacement equipment, comprising a displacement chamber with a limit that is relocatable therein, • a connection channel, connecting the displacement chamber with an opening in the seat, • a drive equipment, coupled to the relocatable limit, for relocating the relocatable limit of the displacement chamber, • adjustable means (8, 25, 27) for limiting the relocation of the relocatable limit by the drive equipment, • an actuating element, connected to the drive equipment and projecting out from the upper end of the casing (1.1), for controlling a relocation of the relocatable limit by relocation along an axis, and for adjusting the adjustable means (8, 25, 27) for limiting by rotating the actuating element, • a cylindrical transmission part, which is rotatable in the casing (1.1) and bearing mounted at a certain position in the axial direction, wherein the actuating element is relocatable in an axially extending accommodation of the transmission part and is connected to the transmission part, so as to rotate together with it, via means (15, 16, 17, 18) for rotation-blocked connection, • first means (11, 14) for transmitting a rotational movement of the actuating element to a movement for adjusting the adjustable means for limiting (8, 25, 27) the relocation, coupled to the actuating element and the adjustable means for limiting (8, 25, 27) the relocation, • adjustable means for indicating a metering volume with a display that is visible from the outside, • second means (20, 21) for transmitting a rotational movement of the transmission part to a movement for adjusting the adjustable means for indicating, coupled to the transmission part and the adjustable means for indicating, • an annular circular cylindrical locking element on the outer circumference of the transmission part, • a locking body, which bears against the locking element in the locking position, • means for relocating the locking body into the locking position, • at least one unlocking element (106, 107), projecting from the casing (1.1) and being movably mounted with respect to the casing (1.1), • third means (92, 93) for transmitting a movement of the unlocking element (106, 107) with respect to the casing (1.1) to a movement, away from the locking element, of the locking body from out the locking position, the means (92, 93) being coupled to the locking body and the unlocking element (106, 107), • the transmission part comprises the locking element on the outer circumference, • the locking body has a partly cylindrical acting surface, which bears against the circumference of the locking element in the locking position whereby the transmission part is held fast.