刻度滴管嘅工作原理係喺玻璃或塑料管上方產生部分真空. 釋放真空會吸入或分配液體.
To use a graduated dropper, squeeze the bulb and hold the tip in the liquid. Be sure not to touch the bottom of the bottle. Release the bulb to draw the liquid into the dropper.
Squeeze the bulb to dispense the liquid.