A well known very simple device used to measure the pressure is the U-tube manometer. This manometer consists of a U shaped tube in which the manometeric liquid is filled. The manometer is used to measure the pressure which is unknown by the balancing gravity force and acceleration due to gravity, g = 9.81 m/sec2. The manometer consists of a steel, brass and aluminum material. The graduations are made on the tube in terms of mm or in some condition it is graduated in kilo Pascal. It has a glass tube made up of pyralex glass.