What is cistern manometer?

A cistern manometer is a type of pressure measurement device that consists of a U-shaped tube filled with liquid, typically water or Mercury, where one end is open to the atmosphere and the other is connected to the pressure source. The difference in liquid levels between the two arms of the tube indicates the pressure exerted by the source. This difference can be read directly from a scale, allowing for accurate measurement of pressure in various applications. Cistern manometers are commonly used in laboratories and industrial settings for pressure monitoring.