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Conductivity Measure with CN0359

I am using Analog Device EVAL-CN0359-EB1Z with conductivity and temperature probe from Atlas Scientific. I used a conductivity solution of 12,880 uS, but the results shown on the CN0359 are very different (range 200,000-500,000 uS) from the results I got when using Arduino UNO (close to 12,880 uS). Besides the wiring, what are the possible causes for this to happen?