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manometers are usually used to test slight pressure variations like for filter racks in paint booths in the hotrod world
your measuring pressure not volume so use a small 1/4'' tubing
set up a U shaped hose on graph paper and use a dyed fluid to check differential pressure
but then you have to worry about how to calibrate it or
you can buy a new manometer from graingers.com for $40 or a used one off ebay for $5
if you buy used make sure you can get the right fluid for it as it will be calibrated for the specific gravity of the fluid
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