Reef Fanatic pH controller aquarium

Description

This includes everything necessary to control a device based on pH: the pH controller, pH probe, 4.0 & 7.0 calibration fluid (bottles about half full), mounting bracket, water cover, and instructions.
I used this for about six months, but had trouble calibrating and dialing it in for my reef tank.  It may need a new probe, so I do not guarantee the accuracy of the existing probe.  It may also need different calibration fluid.  The controller is in perfect physical condition.  It has a built-in stand, or it can be mounted with screws.