You bring a U tube made of glass for example grade the tube in millimeter divisions. Fill it partly with mercury or any other suitable fluid if you do not have Hg. Pay attention that Hg is toxic. connect one of the branches of the tube to the point where you want to measure the pressure in it. If the pressure is greater than one atmospheric 760 mm.Hg then the mercury or the fluid will rise in the free branch of the U tube. Measure the head difference between the two branches, say delath which will be equal to the excess in the pressure than the one atmospheric.
Then the pressure p= 1 atmospheric + delath in mmHg.
If the materials is not Hg you can scale the reading by the ratio of the density of the used fluid to the density of mercury.
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