Digital thermometer shows the ambient temperature sensor ambient temperature. The room temperature is shown we may not be accurate due to the conditions of our device, to take the ambient temperature, leave the device on a surface away from sources of heat or cold (a table ...) and unused leave a few minutes, we will show the approximate room temperature enough. Note that having the device in hand, or pocket give you a higher temperature. You can always testing (under his responsibility) to take the temperature of different sources, saving the device on the side refrigerator as the temperature drops until it equalizes with the refrigerator, and if you close to a heat source will rise temperature.
If your device lacks ambient temperature sensor, the application will communicate.
Never use this application to measure temperature for medical purposes, as the collected values are approximate.