My conductivity probe, even when it was brand new and after calibration always reads low. Like 31 PPT when the tank is showing 35 using my Milwaukee Digital meter.
I have made the mistake of assuming my tank salinity has been way low all this time so I got the tank up to 35 on the Apex. In doing that I don't think I've harmed anything long term and I'm trying to bring it back down slowly, but my old standard glass/light refractometer, the Milwaukee, and my LFS confirmed that my salinity is showing 40 PPT even though the Apex is (was) reading 35.
What am I doing wrong? Is there a way to manually offset the probe on the Apex. I know it's time for a new probe, but like I said... It's been low the entire time I've had it. I bought one of the first systems when they came out in 2016.
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