Abstract: A pipetting system having a plurality of tip fittings whose spacing can be simultaneously, quickly, and accurately adjusted so that the spacing between each adjacent tip fitting is substantially identical. The tip fittings are attached one to another by a linkage such as a pantographic linkage. The spacing is limited by an adjustable, slidable stop. Uniformly increasing and decreasing the spacing is accomplished by pulling and pushing a rod attached to one tip fitting.

Abstract: A pipette tip with a volume capacity of at least about 1250 .mu.l that can be used with single channel or multichannel pippetors and that can be used effectively with microtiter tubes, test tubes and microtiter plates. The tip can be a single contiguous piece, typically formed of a material such as polypropylene. The total length of the pipette tip is about 4.0 inches. The tip includes a stem, a head and a midsection disposed between the stem and the head. The tip also includes a passageway that extends longitudinally through the head, the midsection and the stem.

Abstract: An improved pipette tip support rack having a honeycomb structure. The rack includes an array of interconnected sleeves, each of the sleeves being constructed to support a pipette tip therein. The sleeves are connected by bridges which form along abutting, touching surfaces thereof, or which extend between non-touching sleeves. Openings are formed between adjacent ones of said sleeve which occupy substantially all of the space between adjacent sleeves not occupied by the bridges. Inwardly extending lips on the interior of each sleeve support the enlarged portion of the pipette tip and provide a channel through which the stem extends. Interior side walls of each sleeve provide lateral support to the pipette tips. The tray may be used in conjunction with a container to provide ventilation during autoclaving. The tray snaps into the container and rests on shoulders therein. A finger tab is provided for lifting the tray out of the container.