Ya, but for customer sakes, at least you can show a meter at one said location
register area and then go to another register area and note the difference.
(at least with me in a small one floor condo with the back bedroom the same floor plan as the front living room).
My back bedroom has a longer trunk line to its register (lol..not far).
I suppose a nod is as good as a wink.
Still, I wish I owned a good decible meter.
A good one costs in the hundreds.