My Bad. Re-read 1st post. I somehow over looked the transplant into 2 gal pots. Yeah, watering through would be too much. I saw the solo cups with roots coming out of the bottom & went on that. Cant figure how I missed the 2gal pots the first time I read it. If you go with a meter, still feel the soil with your finger. When trying to help my friend, I bought three. One never worked at all, the other two were very short lived, under 2 wks. The more expensive one also had a pH meter which worked, but since I always double checked it against my pH test kit it wasn't saving me anything. Yeah, what Lipps said on steping up in pot size one size at a time. Again, sorry I missed the 2 gal pot size. That was a very important thing.