Thanks for the help. I was looking at the Hanna pH meter. I've also read that about the ppm and have you should focus more on the pH versus ppm.
That depends on how much yield you want and what quality you want.
I found that documenting my many grows with a journal showing ppm's and ph, I have been able to double my yields and produce totally topshelf, "high demand" quality bud.
If you want to continue to improve your growing skill, you need a ph meter
AND a ppm meter. I went with the hanna combo meter (the black one)... about $160. Well worth it.
Anyone can grow pot. But not everyone can grow high quality, high yielding meds. It's an art that can be learned but you have to take the time to do it and do it right.
Good luck dude.