The sensor needs to be exposed to temperatures over 100 degrees Fahrenheit to calculate an ambient temperature
Ambient temperature readings can take some time to calculate, in which case "..." will be displayed. The lower the temp, the longer it can take.
Your readings may also differ from the reading on your oven or grill, as those readings are either an average of the appliance or a specific location within the appliance. The Smart Thermometer shows you the temperature directly around your meat