A graduated cylinder is a common laboratory instrument used to measure the volume of liquids accurately. It is typically made of glass or plastic and features a tall, narrow shape with markings along the side. These markings indicate the volume of liquid in milliliters (mL) or liters (L), allowing for precise measurements. Graduated cylinders come in various sizes, ranging from 10 mL to 2000 mL or more. They are designed to provide a stable base and a spout for easy pouring. Unlike beakers, which are used for mixing, graduated cylinders are specifically intended for measuring, making them essential tools in scientific experiments and research.