New to the apex so im not sure if its user error or my temp probe may need replaced. I calibrate my temp probe and set it to what my ranco temp controller says and my mercury thermometer. (They both say 79) so i calbrate the probe to 79. My probe is in the inlet part of my sump far from where my heater is at. So, for a few days the apex reads what i think it the correct temp, i double check my other temp sources and they still read 79 but my apex it saying its 77.5 etc. Its like it steadly goes down after everytime i calibrate it. I have it configured ON at 82.5 and OFF at 83.5. My tank has never been that warm. My heater is set to 84. My tank does not go above 80. I cant figure this out and why my apex says its 79 fews days later, 78, another day 77. Just confused on what im doing wrong or if its a faulty temp probe.
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