snowmansnow Well-Known Member Market Messages 4,967 Reaction score 371 Apr 1, 2017 #1 anyone have issues w the neptune PH probes reading low?
porpoiseaquatics Active Member Market Messages 2,789 Reaction score 3 Location Johns Creek GA Apr 1, 2017 #2 When I had mine, I had to calibrate them often...they just read off on both sides.