D. K. Instruments pvt. Ltd. An iso 9001:2000 certified company manufactures a wide range of level, flow and pressure instruments. As a part of that manometer are special instrument which is used to measure air pressure is to balance a column of liquid of known weight against the air pressure and measure the height of liquid columns, so balanced. The units of measure commonly used are pounds per square inch [psi], inches of mercury [in hg] using mercury as the fluid and inches of water [in w.C.] using water or oil as the fluid.
