The implementation being demonstrated by Jing Li of NASA Ames has it as a cell phone case, looking very much like it would latch onto an iPhone. It could just as easily be adapted for other devices, of course. In a nutshell, there are 32 nanosensor bars on a chip about the size of a postage stamp. Each of these bars is composed of different nanostructure material, reacting to different chemicals in different ways and providing real-time monitoring.
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The implementation being 