Recently decided to get an apex and I just setup the probes yesterday, calibrated the pH and salinity ones and just dropped the ORP and temp ones straight in,
the ORP readings were at 800 slowly dropped to 400 and stayed there for a while and than quite literally dropped to 0 and stayed there...
I have for sale are the probes and the Apex WiFi Brain only. Selling it as a bundle. Pulled from a system but don’t have the caps for probe storage. Probes will probably still be good but can’t guarantee so selling at a low price. $350 shipped for it all
Brand new Apex ORP Double Junction Probe - never used. I bought an Apex 2016 and don't need ORP. $75 shipped.
https://www.bulkreefsupply.com/lab-grade-double-junction-orp-probe-neptune-systems.html