For PH pens a little while ago I would have recommended the one I use (Adwa 100) but as it and the same brand a friend uses have both kicked the bucket after less then a year I won't recommend them. Alot of people like the milwaukee ph meter and if you can buy stuff off e-bay then they look a more reasonable cost than buying retail. Whatever you get, a meter really is just so handy - especially when things go wrong. I did keep my drop kit tester that I used first, just as a back up.

How long have you been growing this girl, is she going to be a mom or go into flower?