Inspired by the impressive capabilities the “Tricorder” applicatilon instilled in my normal Android devices, I decided to do a little research. I specifically wanted to find applications that interact with the physical world in interesting and meaningful ways.
I came up with a list of applications that can turn your phone into a metal detector, a document scanner / photocopier, a heart-rate monitor, a telemetric measuring device. and even a geiger counter. All these apps are freely available on Google Play. See the complete list, including my own tests, descriptions, and download li.ks on my Cool and Useful Apps Hub.