Interesting feedback. How long have the probes been in use? Have you ever cleaned them and, if so, how?Salinity drifts constantly and seems to be getting worse. You can sometimes swish the probe around and it will go back to normal but what I’m seeing is that is no longer working and I am calibrating constantly. Just calibrated last night and again this morning. And I don’t think you can replace the salinity probe I could be wrong though.