Well I just got my Apex controller and PM1 module. I didn't realize that the PM1 only lets me control 1 PH/ORP I needed 2. So I just ordered another PM1. but since JLaquatics has all the Apex on sale I also got a PM2, Conductivity Probe and Temp Probe. Mind as well. Freak this HOBBY IS EXPENSIVE. :O Hopefully that's all I will need for now.
GO BIG OR GO HOME !!! LOL
Erick