The ph meter is going to work best when you have good contact from prongs to soil, which should be damp. Those meters can be finicky, so be patient. Take several readings each time, its not going to be perfect, but you will be able to get a general handle. A ballpark figure. If you don't mind fussing with test strips or capsules, they are very cheap and offer reliable readings.
So... This is it. This time, let them come up, establish good root systems, and we take it from there. You're getting closer.
just to let you know, I have at least $700 invested in my little shower op, and that's small peanuts on RIU. You might find yourself investing more and more. If that's discouraging, just remember, the buds get better as you go lol.
I look forward to seeing updates man!