| 摘要 |
A pipette having a frame part with a cylinder formed thereinside, a piston slidable in said cylinder and gasketed in relation thereto, a spring urging the piston towards its upper rest positition, and separate filling and emptying press-buttons provided to press said piston downwards in connection with filling and emptying the pipette respectively, the filling and emptying press-buttons being provided with movement limiting members related thereto in such manner that the piston can be pressed to a lower level by emptying press-button than by the filling press-button. The press-buttons may be arranged in such way that in their rest position the emptying press-button is at a slightly higher level than the filling press-button and that both buttons can be pressed down to essentially the same level.
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