An analog manometer is a device used to measure the pressure of gases or liquids. It typically consists of a U-shaped tube filled with a liquid, such as mercury or water. The pressure difference between the two sides of the tube causes the liquid to rise or fall, providing a visual indication of the pressure level. These instruments are commonly used in various applications, including HVAC systems, laboratory experiments, and industrial processes. Unlike digital manometers, analog manometers provide a continuous reading and can be easier to read in certain situations, making them a valuable tool in pressure measurement.