Bought this to improve air control on my airbrushes. Sometimes I need to use very low air pressures. The regulator on my compressor was impossible to adjust below 10psi with any repeatability. I bought the 3 to 30psi version and put it downstream from the air compressor regulator. I located it so it is at hand while I'm painting. It works beautifully at ultra-low pressures with my .2mm detail airbrush. If you are getting one to use for this purpose be advised that you may have a problem finding the correct adapter. I needed to adapt the 1/4" female NPT on the regulator to the 1/8" BSP thread used by Iwata and many other airbrushes. So, I needed a 1/4" NPT male x 1/8" BSP male adapter. After searching the internet for 2 hr. I decided no one makes such an adapter. I ordered some 1/4" BSP male x 1/8" BSP male adapters. The 1/4" BSP threads are close enough you can get about 3 threads engagement into the regulator and maybe get it to seal with a lot of teflon tape. I decided to chase the threads on the adapter with a 1/4" NPT die. I was able to get full thread engagement but it still took several wraps of teflon tape to get a good seal. Installing this in my system was a PITA but well worth the effort.