folks with 888ds, i just got mine and i noticed that they made the the worst UI choice ever in that CALIBRATING the temperature and SETTING the temperature are almost exactly the same procedure, except that one of them requires pressing the enter button for ONE second (temp set) and the other for TWO seconds (calibration)
FACEPALM
you can tell which mode you're in by the temp display. if it has two dots at the bottom, you're setting the calibration, not the temperature. if it doesn't have two dots, you're setting the temperature. note that there is no "reset to factory" if you do mistakenly recalibrate. it may be possible to wipe the nvram or whatever it keeps the offset in, but i haven't gotten to that part of the manual yet.
my advice: search for amico thermometer on amazon and get a very cheap type K thermometer (25$) in case you need to recalibrate the regulator after mistakenly calibrating it instead of changing the regulator temperature. make sure the type K probe and thermometer you buy goes up to at least 250 deg C.