building a flow bench?

krazykuda said
You can build a simple "manometer" at home. (manometer is a gauge to sense pressure drop).

determine the sensitivity of your "gauge"..

slope the manometer. they have to be leveled. the flatter the slope, the more sensitive

here "inclined manometer"

https://www.google.com/search?newwi....msedr...0...1c.1.61.img..6.2.230.Sb7THp3YZoY

https://www.google.com/search?newwi....msedr...0...1c.1.61.img..8.8.763.ezfssbGfHK0