Not the easiest to see, but here is a SMOKE TEST through the Air-Assist Nozzle v1.04.
I tried incense through the air-pump & it didn’t show any visible smoke. Then I had a brilliant idea to just light a cigarette & blow the smoke through the pipes. It shows vaguely what is going on with the smoke as it exits, but I guess the PSI of my breath through tiny pipes is not correct in comparison to the pumps. The smoke should funnel in further away from the nozzle end-point (at 50.8mm from the lens, which would be about 40.8mm from the base of the nozzle).