A caliper is a measuring tool used to determine the dimensions of an object, such as its length, width, or depth. It typically consists of two arms that can be adjusted to fit around or inside the object being measured. Calipers can be made from various materials, including metal and plastic, and are commonly used in fields like engineering, woodworking, and metalworking. There are different types of calipers, including vernier calipers, dial calipers, and digital calipers. Each type has its own method of reading measurements, with digital calipers providing electronic displays for easy reading. Calipers are essential for achieving precise measurements in various applications.