Mini-pipette

A mini-pipette comprising:

• an outer body having a hollow movement space and a suction passage formed at a lower part of the outer body;
• a push button for generating negative or positive pressure in the suction passage while reciprocating in the movement space of the outer body;
• elastic means for elastically supporting the push button in the movement space;
• and
• a capacity varying means formed inside the outer body, for varying a movement distance of the push button in the movement space,
• wherein the capacity varying means comprises at least one interference protrusion aligned in a height direction and protruding from an inner circumferential surface of the outer body toward the movement space, and
• wherein the push button comprises an inner body having a non-circular cross-section with a first plane length that is greater than a distance between the interference protrusions and a second plane length that is smaller than the distance between the interference protrusions, such that rotation of the push button selectively engages or disengages the inner body with the interference protrusions to provide discrete volumetric settings for precise micro-volume liquid handling.