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Old 10-28-2012, 09:21 PM
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distilled water

The guages are often read in "inches of water" - the depth of the "U" tube has to be something over 30 inches I believe. I've seen 1/4 and 5/16 aquarium type tubing used to make the "U".

One tube is exposed to atmosphere (with no air flow over the open end) and the other end exposed to the pressure you are testing - it is a comparitor device. You want to measure the difference in the height of the water on both sides of the "U".
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