As its name suggests, the LightMeter turns mobile devices into portable light meters. Using the readings, the app will also suggest scenarios—such as "ideal for reading printed paper of high contrast"—for which the measured light levels are well suited. Measurements update in real time and can be displayed in footcandles or lux. Readings can also be fixed for delayed viewing. Whitegoods offers the app for the iPhone, iPad, and iPod Touch. inter-lux.com/manufacturer/whitegoods