A gauge is a tool used to measure the size, amount, or capacity of something. It can refer to various measuring devices, such as a ruler for length, a thermometer for temperature, or a pressure gauge for measuring gas or liquid pressure. Gauges help ensure accuracy in various fields, including engineering, manufacturing, and science. Different types of gauges serve specific purposes. For example, a caliper measures the distance between two opposite sides of an object, while a multimeter measures electrical properties like voltage and current. Understanding how to use these gauges is essential for obtaining precise measurements in various applications.