The Yummly Smart Thermometer has two temperature sensors. One is located near the bottom of the stainless steel probe (to measure the internal temperature of your cut of meat), the other is located at within the black ceramic top and measure's the ambient temperature of your cooking appliance.
The ambient temperature gives the Smart Thermometer a better understanding of cooking conditions when calculating cooking times, and for advanced cooks can be used as an additional temperature reading of the air directly surrounding the meat. The ambient temperature sensor (within the black ceramic top) can withstand 570f continuously and 1100f flare-ups for up to 10 minutes.