Im looking for a used controller like the reef keeper 2 or similar

[winereef]

need to have capability to:
run lights (turn off when temp is to high)
run a channel when ph drops (run a kalk reactor)
Calibration kit
nice to also have a internet application.

http://www.reefcentral.com/forums/showthread.php?t=1830119

 

[shaneh]

As far asi know the RK2 will not- run a channel when ph drops (run a kalk reactor)
I've had mine for 1 1/2 years and i do like it but i think the net elite is better. But it also cost $400 or $500. But you do get the ORP read too. If i had the money i would upgrade.

 

[winereef]

As far asi know the RK2 will not- run a channel when ph drops (run a kalk reactor)

I think you can run a dosing pump when ph drops. here is the link on how to do that. http://www.forum.digitalaquatics.com/viewtopic.php?f=3&t=6764