Well, I know that this flow meter isn't going reveal the PPMs but I also know that to get to 15,000 ppm, all I need to do is get the CO2 to 1.5% as it is naturally occurring on earth at 400 PPM, or approx. .04%. A 4x4x7 foot tent is 112 cu ft. Now to get that 112 cu ft tent filled to 1.5%, I...