There you go.
The manometer is rather simple. you hook up tees at the pumps inlet and outlet, so that you can run two tubes up vertically. Fill the whole system with water, until you get a level that sits in the middle of those vertical tubes. Then when you turn on the pump, one of the levels will drop, and the other will rise. Measure the difference in height, of those two levels: the result is the amount of pressure that your pump is supplying.
Keep in mind that the pressure could be as high as [1.5 meters water column], so the level should rise up and down accordingly. In other words, use a pretty long run of tubing, ~ 2 meters should do.
The tubing diameter is irrelevant.
Then lookup that height on the pump's curve (posted above) to see what the actual flow rate is.
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