SOGfarmer Well-Known Member Mar 29, 2012 #1 So i got a new bluelab ph pen. What is the difference between the differnt ph settings (for ex: 500, 700, or ec), and which one should i use and why? i really have no idea and cant find much reliable info on this. thanks.
So i got a new bluelab ph pen. What is the difference between the differnt ph settings (for ex: 500, 700, or ec), and which one should i use and why? i really have no idea and cant find much reliable info on this. thanks.
