Digital Geiger Counter is an iPhone application that allows users to prank their friends by simulating a geiger counter and measuring fake radiation levels. The app has been praised for its realistic design, including an easy-to-read LCD display and an authentic audio click rate. Users can switch between microsieverts and millirem or count per minute scales and can choose from alpha, beta, and gamma modes. The app also features dual tilt-sensitive and touch-sensitive controls and synchronized iPhone camera flash.

However, it is important to note that Digital Geiger Counter is meant for entertainment purposes only and is not capable of detecting actual ionizing radiation. The app is factory-calibrated to the x-axis and contains no user-serviceable parts. Overall, Digital Geiger Counter is a fun prank app that can be enjoyed by those who want to fool their friends and have a good laugh.