Geiger Counter is a fake application for you joke to your friends.
With Geiger Counter you can fool someone into thinking that approach a radioactive area but actually be approaching a Wi-Fi.
The closer you are to a Wi-Fi, Geiger Counter will increase noise such as an really Geiger counter would do when it approaching a radioactive area.
Move away those spongers of your Wi-Fi!
Now you can use it offline!