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i have a ph pin an that thing is the hardest to calibrate,it jumps all over and i feel im not getting a accurate reading.ive been looking into ph/ec meters monitors and controllers.i wanted to no if anyone had any suggestion,LoL im looking for easy thanks

ive been growing for awhile but never have used co2,im ready to step it up.im going to buy a co2 generator(cap gen1 eletric/starter) .for the controller i was looking at a cap air3 its about 180 dollars (most controllers cost more than the generators)its supposed to turn the co2 on when the...