Calipers are precision measuring tools used to determine the dimensions of an object. They can measure internal and external dimensions, as well as depths. Calipers come in various types, including vernier calipers, dial calipers, and digital calipers, each offering different methods for reading measurements. They are commonly made of metal or plastic and are essential in fields like engineering, woodworking, and metalworking. To use calipers, the user opens the jaws of the tool to fit around or inside the object being measured. The measurement is then read from a scale or digital display. Accurate measurements are crucial for ensuring proper fit and function in various applications, making calipers a valuable tool in both professional and DIY projects.