I have full apex system that I will sell for cheap. it has both ORP and PH probe including the temp probe. here is the catch.
I took it out of my tank so it has been sitting in my basement for 6 moths. the probes are out of the water but I was told if you keep them in a tank for 2-3 days and then calibrate them, they will work. not sure if its true.
my basement flooded and the apex base unit was at the bottom box. the base unit turns on but it doesn't do anything. the display unit works fine, the energy bar 8 works fine. I will let go the whole setup for 125$. you pay shipping. let me know if you are interested.