Hello guys, I have followed all the directions to calibrate the salinity Conductivity probe for my profilux 4 and with the probe in the tank it still reads 1.021 while all my other probes(milwalkee, and refractometers) show tank at 1.026. I even took the probe out of the tank and directly into the solution and it is currently reading 1.020. Do i have a bad probe? Please advise further. All firmware is updated. I contacted GHL support before, and they told me to set the variation to make up for the difference, its just my belief that would that be a wise/accurate thing to do if it is indeed off? Isnt that just masking/band-aiding it? Please help