Temperature is displayed in Celsius. 


To switch it back to Fahrenheit, please follow these steps. 

1) Thermometer has to be turned OFF. 
2) Push and hold the "Ear" button. 
3) The thermometer will display a "M" in the lower right corner, do NOT let go of the "Ear" button, keep it pushed until you see a "C" flash. 

4) Let go of the "Ear" button and then short press it one more time. The "C" will change to a "F". 

5) Wait until thermometer turns off which will save the Fahrenheit selection.