manometers
along with the manometer you might also check out the 'manometer-in-a gauge' Magnehelic,by Dwyer Instuments.
Along with a Pitot tube you can measure pressures and also double as an airspeed indicator (0-3-inches water column range is useful).
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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