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These pipettes commonly come in 5, 10, 25, and 50 mL volumes. A variety of propipetters [clarification needed] have been developed, both entirely manual and electrically assisted. Originally pipettes were made of soda-lime glass, but currently many are made of borosilicate glass; disposable graduated pipettes are often made of polystyrene.
[2] [3] They thus are used for smaller-scale transfers than equipment such as graduated pipettes, which come in 5, 10, 25 and 50 mL volumes. The most common type of pipettes can be set to a certain volume within its operational range and are called adjustable. These pipettes commonly have a label with their volume range like "10–100 μL".
Air displacement micropipettes are a type of adjustable micropipette that deliver a measured volume of liquid; depending on size, it could be between about 0.1 μL to 1,000 μL (1 mL). These pipettes require disposable tips that come in contact with the fluid. These pipettes operate by piston-driven air displacement. A vacuum is generated by ...
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