I have 3 pcs EX 15 concentrators in parallel. I originally brought
them for my glass bead lamp working. I needed lot of oxygen for my
Now I’m using one of them for the jewelry work. Mostly I need the
heat for gold casting.
I’m been very happy of these concentrators. Those are safer and
cheaper in the long run.
The only draw back is the low buzzing and the need to have the
oxygen flowing all the time.