I've been using a spa PH tester. Maybe not as accurate as a meter but I believe it's close enough

I don't know what a spa tester is, but a PH meter is like 30 bucks. You just dip it in your nutes and it gives you a reading. And when it comes to PH "close enough" isn't. PH cannot be wrong or you will be screwed.
Opie Yutts Reviewed by Opie Yutts on . Bubbler System Question Been getting alot of good info here, thanks Latewood and all. I have been growing in dirt for sometime now and had a hydro kit that I bought setting around and finally decided to give it a go. Soo... Do I put the Rockwool at the bottom of the net pots let them get wet for a day then put the seeds in the Rockwool and cover them with the little round stone sort of things? I was hoping to start this morning but noticed last night, when I put the stones in first that alot of them fell Rating: 5