“Here’s a cool trick: the new Sonar Ruler app uses the iPhone’s speaker to send out a short click and then measures how long it takes for the sound to bounce off a surface. It then tells you the distance.”
Now can someone expand the app so one can wave it around a room and end up with a 3D model of the space. And hurry, we need this to find the Joker. (via Gizmodo)
Source: Gizmodo
