Joel,

This is the one I've got J,
Hanna Gro'Chek Continuous pH/TDS/EC/Temp @
http://www.bghydro.com/BGH/itemdesc....OHACL2&eq=&Tp=

I still haven't used it, so I'm unsure of its performance. But I think it'll work out fine. $130

As to latewood's PVC skills... he can help you alot... but keep in mind that latewood has a psychic ability to cut, thread, join, seal and setup PVC systems with his mental powers... LOL! Have you seen his setup?! Boy... what would I give to clean my hands in his bathroom sink!