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This seems to be my problem.

The blue ring changes the temp and the red ring is just a marker.

I have finally got the heater to a stable temp but there is no way to move the red ring far enough to match the real temp. I contacted Eheim with a complete description and photo's and all they did was send me a generic video of how to adjust it which I have seen before. I know how to adjust it...

Please explain as my little brain doesn't understand. A=as far as the red ring can be moved downward. B=what the temperature should be 71 degrees before calibration. Actual temp in 78 degrees. C=as far as the red ring can be moved in the other direction before B hits C. I need to move B to 78...

I just purchased your Eheim Jager 250 heater for my new 60 gal freshwater aquarium ( I also bought your Professional 4+ 600 canister filter). My problem I am having is with calibrating the heater. I set the thermostat to 78 degrees (I have an external digital temperature gauge I am comparing...