K Kakarot Guest Aug 2, 2015 #1 I have HM-Ph-200, Do I need a PPm meter as well or can I just test runoff with the HM200?
oddjob Joined Sep 7, 2012 Messages 52 Reputation 0 Reaction score 84 Points 0 Aug 2, 2015 #2 Its good to have a ppm meter nust to monitor your feed levels, dont just go by run off.
I have HM-Ph-200, Do I need a PPm meter as well or can I just test runoff with the HM200?
