Regulator test rig you don't need to suck.

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Yes (from the schematic by @rsingler it is to reduce the vacuum volume "intensity", and is an adjustable valve)
I use a length (3 feet) of tubing teed from the pump output. One side goes to the mouthpiece the other is coiled up with the end open. Works perfect.
 
Input, not output, we are talking vacuum.... (sorry, it is the engineer in me)
 
I'm not sure yet about better adjustment but it certainly enables better accuracy. For example I am able to discriminate between two identical Aqualung legend 2nd stages, one measures 7/8" wg and one measures 1" wg. That's 1/8" difference which is 1/16" on each side of the manometer.

I checked all my regs after I finished the test rig and all are within manufacturer's specification so I haven't actually done any adjustments
Do think you could tell the difference in how they breath in a blind test?

Measure with a micrometer, mark with chalk, cut with an axe, hammer to fit
 
Do think you could tell the difference in how they breath in a blind test?

Measure with a micrometer, mark with chalk, cut with an axe, hammer to fit
With a good set of lungs you could. :)
 
I used this drip adjustable irrigation sprinkler head. Home Depot. It's basically a plastic needle valve.
Screenshot_20210425-192843_Home Depot.jpg
 
Input, not output, we are talking vacuum.... (sorry, it is the engineer in me)
Not so sure:
Dictionaryout·put
/ˈoutˌpo͝ot/
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noun
  1. 1.
    the amount of something produced by a person, machine, or industry.
    "efficiency can lead to higher outputs"
 
Not so sure:
Dictionaryout·put
/ˈoutˌpo͝ot/
Learn to pronounce
See definitions in:
All
Economics
Technology
noun
  1. 1.
    the amount of something produced by a person, machine, or industry.
    "efficiency can lead to higher outputs"
If you look at the pump as a machine it’s the input. When you inhale your inputing not outputting. Lol
 

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