Steve, It all depends on which model you have how to change between fahrenheit or celcius. With the B model unplugged you hold the select button in (depress), plug the unit in and hold the select button for 3 seconds. the machine then gives an audible double beep. When you hear the beep, release that button
Now use the chevron up or down to change back and forth between C or F. When you have display temp you want to use, press the eject button
If you have a different model, go to their online site and choose the model you have and download the user manual. That info will be in there
Jake
Reddick Fla.
"It's never too late to have a happy childhood"