My new conductivity probe doesn't seem to be holding a reading. Looking at the attached graph you can see where I re-calibrated the probe. It seems to gradually float down for about 10-12 hours then stabilize. Just now I put the probe back in the calibration fluid and it read 34.5. A tiny bit low but it was close. Put the probe back in the tank at in read 32.5. This is a new probe and the graph shows the life of the probe. Any ideas from the brainiacs here?
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