I bought a used Neptune system for the frag tank I'm setting up that came with PH and ORP probes, but decided to attach the ORP probe to my main tank because it's only the classic Neptune with no ORP probe.
How do I tell the ORP from PH probe in this used system I purchased? Both look alike, both have the same connector, both are blue, one is longer than the other. Both have 2012 dates on them (are they still good?). I hooked up the one with a 19-004-0003 number on it as an ORP probe because I found a single reference to 19-004-0001 maybe being PH. I'm only getting a reading of 120 though, seems wrong?
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