A gauge consisting of a U-shaped tube partly filled with a liquid to measure the pressure, vacuum and differential pressure, is named a U-tube gauge. Observator makes the sturdy U-tube gauges of solid Polymethyl Methacrylate (Perspex)with precision bored tubes. The U-tube gauges have ranges, from 10 to 110 mbar, and can handle static pressure up to 20 bar, for measuring the pressure drop over filter of the ABB turbocharger

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