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Pipettes come in several designs for various purposes with differing levels of accuracy and precision, from single piece glass pipettes to more complex adjustable or electronic pipettes. Many pipette types work by creating a partial vacuum above the liquid-holding chamber and selectively releasing this vacuum to draw up and dispense liquid ...
Plastic Pasteur pipettes. An eye dropper, also called Pasteur pipette or simply dropper, is a device used to transfer small quantities of liquids. [1] They are used in the laboratory and also to dispense small amounts of liquid medicines.
A small pipette allows for more precise measurement of fluids; a larger pipette can be used to measure volumes when the accuracy of the measurement is less critical. Accordingly, pipettes vary in volume, with most measuring between 0 and 25.0 millilitres (0.00 and 0.88 imp fl oz; 0.00 and 0.85 US fl oz). [2]
A Mohr pipette, also known as a graduated pipette, is a type of pipette used to measure the volume of the liquid dispensed, although not as accurately as a volumetric pipette. [1] These use a series of marked lines (as on a graduated cylinder) to indicate the different volumes. [ 2 ]
Whereas manual pipettes need a movement of the thumb (up to 3 cm), electronic pipettes have a main button. The programming of the pipette is generally done by a control wheel and some further buttons. All settings are displayed on a small display. Electronic pipettes can decrease the risk of RSI-type injuries. [8] [9]
A burette (also spelled as buret) [1] is a graduated glass tube with a tap at one end, for delivering known volumes of a liquid, especially in titrations.It is a long, graduated glass tube, with a stopcock at its lower end and a tapered capillary tube at the stopcock's outlet.
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Release the pipette knob slowly to the ready position. Do not remove the tip from the solution. Repeat this process (step 3 and 4) to rinse the tip until the interior wall of the tip is clear. Remove the tip from the solution. Press the pipette knob to the second stop, and completely empty the tip. Release the pipette knob to the ready position.