The pH meter is accurate and good!! here I also noticed that when I first made EC 0.6 and pH 5.9 it seemed to me that after a couple of hours all the plants felt better!! but according to on the advice of a respected)) BigDaddyK-who advised to raise the EC to 1.1-1.3 after that, they got even worse( and why did I just listen to him!!! what other tips will there be on finding the cause of this problem with plants!! and what else do you need to do besides adjust the pH! ? this problem can be caused by a strong wind inside the tent!?