I know it's none of my business and I'm offering unsolicited advice but I have an Apex PM2 and it's not as reliable as this. Reason being that salinity monitors and controllers use conductivity probes which is very sensitive to temperature/stray voltage placement, bubbles etc. They are good and dandy and nice to have for the ballpark number but in my experience nothing replaces a good ol' refractometer (a very good one in this case). So I would advice you keep this until you get your controller/monitor if possible so you can see if you're happy with it.
Just my .02 :)
PS: To everyone else this is a great deal and you should snatch it before it's gone. This is going to be a great piece of equipment to have!
