ok, i went to the hydro shop yesterday to check out a new co2 controller/ monitor because as of right now my co2 tank is just running at what i have it set to.i was lookiing at the c.a.p. Ppm-4 but the guy told me not to waste my money because they are junk.he suggested one by i.g.s. (intelligent growing systems) this one cost twice as much so i dont know if he was trying to work me on a higher price or just giveing me good advice. Any opinions on a good working/ fairly priced monitor/ controller?????