It's a simple way of having the same restriction.
For a cheap test, you can measure the landing point of the jet, sideways, or the "shooting height". Mostly for fun though, not terribly useful. Good for a rough comparison.
For something more accurate (and useful), one can measure the flow rate, at which point a flow meter is required (isn't it always?).
Personally, I'd much rather set the flow rate, and measure the pressure drop: the comparison of the results is easier that way, but it's gotta be done right.
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