A manometer is an instrument used to measure the pressure of liquids and gases. Manometers are widely used in industries such as hydraulics, pneumatics, and HVAC to monitor and control pressure levels within systems, ensuring that they operate within safe limits.

There are several types of manometers, including analog manometers, digital manometers, and differential pressure manometers. Analog manometers, which feature a dial and pointer, are common in industrial environments, while digital manometers provide more precise readings and are often used for highly accurate measurements.

Calibrating a manometer involves adjusting it to ensure it displays accurate pressure readings. This is typically done by comparing its readings to those of a reference manometer known for its accuracy. Regular calibration is essential, especially in critical systems, to maintain precision and reliability in pressure measurements.