Sean, did you recalibrate then set the TC factor? Is that what I'm reading?Check out this thread. This worked wonders for my salinity probe stability.
(Almost) Everything You Need to Know About Apex Salinity Calibration and TC Factor
I was trying to calibrate my new salinity probe a few weeks ago, and ran into all sorts of problems. Calibrations that were way off the mark, big fluctuations in readings that couldn't possibly be correct (and were verifiably not), etc. After searching around the internet, it was clear that a...www.reef2reef.com