| 摘要 |
A cap (1) can be adapted to fit any vessel by screw-thread or clips, and takes the other parts of the assembly. A rod (2) has at its lower end a gasket (4) for a liq.-tight seal with the inside of the tube (5). The top end of the rod is a disc acting as a stop. The rod has several faces with different graduations and colours, corresp. to liq. viscosities. - The knob (3) is located in the cap by a pin (6). It has a toothed rim which engages with a matching face on the rod, to move it up ir down the tube.
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