If the above mentioned relative pressure measurement is provided with a second connection and also the enclosure at the height from the connection is sealed with a bellows, two different pressures can be in contrast with each other. Liquid crammed pressure gauge is actually a Unique sort of pressure gauge. https://iwatchbands46343.digiblogbox.com/56314185/everything-about-bourdon-tube-stainless-steel-case-pressure-gauge