Abstract: A pipette has a pipette tip mounting shaft having multiple sealing zones, with each sealing zone abutting a stop, which prevents a pipette tip from being placed on the shaft with excessive force. As a result, differently sized pipette tips, can be sealingly engaged on the shaft, and each can be ejected with a minimal amount of force.

Abstract: A flossing device having a stabilizing member and preferably a thumb-driven floss movement mechanism. In one embodiment, the flossing device includes a shaft includes an operative end and a distal end, the distal end terminating in first and second fork arms. The fork arms each have a closed end connected to the shaft and an open end, and each include an aperture for receiving dental floss. The flossing device also preferably includes a stabilizing member attached to and between the first and second fork arms, said stabilizing member operable to be engaged by teeth to reduce movement of the shaft when the shaft is inserted into the mouth. The flossing device also preferably includes a thumb-driven floss movement mechanism operably attached to the shaft. This mechanism is operable to cause dental floss to move between the apertures of the first and second fork arms, thereby effectuating cleaning action by the dental floss.

Abstract: An adjustable hand-held pump adapted to measure microliter quantities of liquids includes a frame having a handle with a cylindrical opening formed therein. A threaded shaft is disposed and slidable within the cylindrical opening. A volume adjustment wheel is rotatably disposed within the frame at a stationary axial position and mechanically engages the threaded shaft to position the threaded shaft at a predetermined axial position within the cylindrical opening, thereby providing liquid volume adjustment.