Serological pipettes are laboratory tools used to measure and transfer precise volumes of liquid. They are typically made of glass or plastic and come in various sizes, usually ranging from 1 mL to 50 mL. The pipettes are marked with graduated lines to indicate volume, allowing for accurate dispensing of liquids in experiments. These pipettes often feature a tapered end for easy insertion into containers and a bulb or suction mechanism for drawing liquid. Serological pipettes are commonly used in biological and chemical laboratories for tasks such as cell culture, reagent preparation, and sample analysis.