Serological pipettes are narrow plastic tubes with volume markings used to transfer small amounts of liquid in laboratories, cosmetics, and food manufacturing. They can be disposable or reusable, and some have pumps for draining. They are often used in scientific and educational settings and can be labeled and color-coded for specific sizes and types.
Often used in biological laboratories, as well as in cosmetic and food manufacturing, a serological pipette typically helps transfer small amounts of liquid. It is typically a relatively narrow plastic tube with markings for volume measurements, which are usually labeled in milliliters. Liquid solutions can be transferred from one location to a different container, and often a small hand pump is used to draw all of the fluid out of the tip of the device. Pipettes where some fluid remains and is typically part of the total volume are called to hold, while dispensing variants have extra fluid at the tip which is usually discarded. Most serological pipettes are labeled according to type.
Many pipettes are disposable and can be purchased as one component or in packages of up to 50 or more units. Volume marks are typically obtained during a temperature calibration, which can allow accuracy in a range of 68° to 77°F (20° to 25°C). Inside the serological pipette, liquid typically forms a pattern called a meniscus in response to the internal shape. Researchers can get the correct reading by holding the device up and aligning the underside of the meniscus with the closest measurement line. Measurements can be made by emptying the entire pipette or by discharging a specific amount of fluid by noting the desired volume marking to change the level.
Small portable pumps are often used to drain a serological pipette. These may feature a button to activate, a thumb roller, or a variety of other designs. Some pumps have a filter that may need to be changed periodically. Depending on the application, some pipettes are designed to be more accurate. Many are manufactured as a single part, often molded from a plastic composite. They can also be designed without welds, so there are no pieces inside the pipette that can trap liquid.
A serological pipette may have a cap, sometimes made of cotton, that helps keep researchers from overfilling it. On many pipette packages, the cap may be color-coded along with other labels to indicate specific sizes and types in the package. Serological pipettes and related scientific equipment are often used in laboratories where biological and chemical compounds are used. They are usually non-toxic and are sometimes used in educational settings. Hospitals and even industrial facilities may use serological pipettes as part of their inventory.
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