Ed, how can I mix gas at home for different applications. I have CO2, Argon, Helium, O2, acetilene, and C25. I ran out of C25 in the middle of a job at 10 at night And had to wait untill the next day to get a bottle to finish out 30 minutes of work. Is it possible to mix “home brew ” gas that will work safely? How about two flow meters set to match the percent of gas? Help…..