Patent ID: 8033188

Claim:
A hand-held electronic pipettor comprising: an elongated body adapted to be held in the hand of a user; a touch pad control located on a front side of the body to be operated by the user; a run button located on the pipettor to be operated the user; a user interface display located on the front side of the pipettor above the touch pad control; a microprocessor; and menu-driven software for controlling information displayed on the user interface display and for programming the microprocessor to operate the pipettor; wherein the touch pad control includes a circular touch pad which allows the user to select a desired volume by rotating their thumb or finger around the circular touch pad in either a clockwise or counter-clockwise direction, and the pipettor further has a coarse setting and a fine setting wherein the user can navigate the entire range of available values for volume selection with less revolutions using the coarse setting than the fine setting.