Neptune systems APEX vs APEX lite

[xtreme]

Just to add to that, the reason I opted for the Apex was because I wanted to have tunze control. My ORP port currently sits vacant as I decided not to buy the ORP probe. If you run a Ca reactor you would want the second pH probe so that may be a deciding factor. I run dosing pumps and don't know if its that important to monitor ORP so I could live without the second port.