| 摘要 |
<p>The invention concerns a pipette comprising a mechanism with which the stroke length of a piston (5) can be changed by rotating the piston rod (6). The pipette comprises a locking mechanism (12, 19), which prevents the rotation of the piston rod when the piston has been pushed a certain distance downwards from its upper position, but does not prevent the rotation when the piston is in its upper position.</p> |
