| 摘要 |
<p>A manual pipette (10) including a magnet assist (26) for generating a magnetic force opposing a return spring (18) force on a plunger unit (16) including a piston (38) having an annular low friction fluid tight seal (88a) including an annular ring (93) engaging an outer surface of the piston during movement of the plunger unit, the magnet assist aiding a pipette user in locating and maintaining the plunger unit at a 'home' position within a pipette body (12) and ready for immersion of a pipette tip (15) in a liquid to be drawn into the tip.</p> |
