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what are the advantages of a u-tube manometer than a piezometer
I think you're looking for U-Tube Manometer
The U-tube manometer is a simple instrument used to measure differences of pressure.
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the most common type of manometer are u-tube type,inclined and the cistern type of manometer
air, fluids and very low pressures
equal & unequal leg u tube manometer, cistern manometer, u tube manometer.