Hey guys so this PPM thing is confusing not sure what would be best to order. So there are 2 scales PPM500 and PPM700 now you want one that will measure both scales right? But then there are also some meters that say 0-1999 but from what i read it says you want one that is 0-2000 will 1 point make much of a difference? any body want to recamend one what does every one use? Oh the grow will be in DWC hydro set up
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