iThermometer supports real-time monitoring phone’s and battery’s temperature.You can click on the rim Circle to switch unit between Degree Celsius and Fahrenheit. Android in the rim circle will change its color while the temperature changes: the lower the temperature, the green deepens, the higher the temperature, the red deepens. So when the android turns red, it reminds you had better pay attention to your phone temperature.And let the android cool down.Also you can check what sensor your phone supports.