- Thread starter
- #21
Lonestar11
Well-Known Member
I have to be honest. I use cheap ones. I just calibrate often. I do wanna get better ones but these worked fine on my last grow. Blue labs is a good ph pen. Bout 80 bucks.
Have you heard of the Lucas grow method? I used it on my last hydro dwc. Worked fine. Just google it. Also general hydroponics has a nutrient Calc app. I love it. Pretty close to the Lucas formula. I cross reference it. I have the app on my iPhone. Not sure if the app is available for android.
What's the app called? Can't find on iPhone