Analog manometers are devices used to measure pressure in various systems, such as gas or liquid pipelines. They typically consist of a U-shaped tube filled with a liquid, like mercury or water, where the difference in liquid height indicates the pressure difference between two points. These instruments are commonly used in laboratories and industrial applications due to their simplicity and reliability. Unlike digital manometers, analog manometers provide a visual representation of pressure changes, making it easy to observe fluctuations in real-time without the need for batteries or electronic components.