If you are looking for a classroom timer that will work with the iPhone, iPad, or iPad Touch, the Classroom Timer Pro ($1.99), by Walsall Academy, is easy-to-use and good for timing classroom activities. There is a free version of this product, but the Pro version had better reviews. Glen Storey offers Silent Light—Classroom Timer and Decibel Meter ($3.99) for the iPhone and iPad. It uses the microphones on iPhones and iPads to monitor noise; you can share its screen through projectors and Apple TV. Designed to help students with management and productivity, ClassTimer by Ventura Educational Systems ($.99) requires iOS4.2 and is compatible with iPads.