Best digital thermometer prank description

Mobile digital thermometer is an application to measure body temperature with only your phone and with no additional devices only by using your finger. just like heart rate measuring devices.
The hidden thermal receptors in your touch-screen shall sensing of finger temperature. and calculate your finger temperature correctly.
Application features:
- easy to use
- A quick result
- Does not require additional hardware
Disadvantages:
- Cool screen may contribute the wrong result in the beginning just try again.
- The application used by just a joke with your friends.