Thanks ozoneman for all your help! Your web site is the best I learn a lot, thanks again. I decide to buy a cheap one for drink water first. and buy some ozonated oil. when I gain some experience I'll definitely get a whole system.
I wonder if you have any though on this generator: the AOS-1M from applied ozone system. http://www.appliedozone.com/aos-1m_medical_ozone_generator.html.
look like it has the output control calibrated. It didn't mention Dual-Dielectric as the POG. but do say "Quartz glass dielectric tube and non-reactive materials". the price is pretty good.