Dial calipers are precision measuring tools used to measure the dimensions of an object, such as its length, width, or depth. They feature a main scale and a rotating dial that displays measurements in either inches or millimeters. The design allows for accurate readings, typically within a thousandth of an inch or a hundredth of a millimeter. These tools are commonly used in various fields, including engineering, woodworking, and metalworking. Dial calipers can measure external dimensions, internal dimensions, and depths, making them versatile for different applications. They are often compared to other measuring tools like digital calipers and micrometers.