Mice that are specially designed for CAD drawing programs on the computer, costs quickly tens to hundreds of dollars. With a new iPhone application is now a much cheaper solution. CadRemote is a free app for the iPhone touch screen and tilt movements of the phone used to the drawings on the computer to operate. So you can rotate, zoom and pan (move over an image). CadRemote to use, you need a free program for your PC or Mac may require that you download from the website developer Maiden Inc.. That connects your iPhone or iPod touch in the same WiFi network with your computer. Then you can use the app as you mouse for drawing, such as AutoCad, use. By a finger on the screen to keep tilting the iPhone, you can orbit movements. By the image swipe, and you pan with your finger along the right side, you can zoom in and out. Further hotkeys are at the bottom to activate the cursor, commit, aid, rendering and maximum zoom. Download: CadRemote (free)