yea depends also if ya have got it really dialed in or not too. i have grown in soil for ....15 yrs ...and back when i started no i know ever tested the ph or the ec.:P
when i went to hydro i got the meters to make sure i was doing everything right.I find it depended really on the products used, when i use GH 3 part i never check the ph or the ec i can pretty much do it with my eyes shut.Other products that i have used i had to adjust the ph weekly and so on.
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