Patent ID: 8631682

Claim:
A calibratable pipette comprising: a barrel, a piston moveably received within the barrel, the piston being sealed to the barrel at a sealing location, a first mechanism for establishing an upper limit of piston movement within the barrel, and a second mechanism for determining a lower limit of the piston movement within the barrel, wherein each of the first and second mechanisms is adjustable to allow variable adjustment of the upper and lower limits of piston movement respectively established thereby to thus provide a calibration function to the pipette by allowing piston stroke length to be varied so as to achieve a dispensed stroke volume equaling an intended volume as exactly as possible, and wherein the piston has a variable diameter portion which passes by the sealing location during movements of the piston within the barrel between the upper and lower limits thereof to thereby provide a non-linear interdependence of the dispensed stroke volume with the piston stroke length.