Adjusting the Level of Solution in a Volumetric Pipet
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Solution is typically drawn into the pipet using a rubber bulb. Squeeze the bulb and place it over the mouth of the pipet. Gently release the bulb to draw solution upward. When the level of solution is above the calibration mark, remove the bulb and place your thumb or index finger over the mouth of the pipet.
The level of solution is lowered by allowing air into the mouth of the pipet. Partially lift your finger for slower dispensing. Remove your finger for quicker dispensing. Replace your finger to stop dispensing.