@Arthur OK after my slurry..60ml of soil,60ml of water,let set for about 30 seconds..PH was 6.39 in auto ..and 6.58 in photo both plants are the same soil..those numbers seem to be OK to me??also my pH pen is about 2 months old..calibated when I bought it,and not since..also maybe silly question but how long do batteries usally last for pH pen..just trying to cover everything
Last edited:
