This app is intended for entertainment purposes only and does not provide true Thermometer functionality.
Thanks to the built-in barometer of your iPhone 6 / 6S / 6+ / 6S+ this app calculates an approximate temperature based on the law of Boyle. After a one-time calibrating your iPhone can calculate your current sourounding temperature. But still, a classic thermometer will be always more accurate than the App.
It is therefore important to note that the temperature measurement is carried out exclusively in closed rooms. Open doors and windows may reduce the accuracy significantly!
Have fun with the app!