I recently purchase a GHL system and order a Freshwater Conductivity probe and the Freshwater Conductivity/Redox module (PL-0002) - I have discovered that I have in fact been sent the Saltwater Conductivity probe as apparently you do not do the Freshwater probe anymore - it however looks like I have still been sent the PL-0002 instead of the PL-0004.
Can you please explain the difference between the PL-0002 and PL-0004.
I am new to this but the conductivity values I am seeing do not look correct.
Thanks
Greg
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