Good Gear Guide
In Pictures: Swiss Army smartphone - 7 tools your ...
Thanks to its built-in sensors -- typically including GPS, gyroscope, accelerometer, magnetometer, and microphone -- your smartphone can easily serve as a variety of tools for carpenters and other handypersons, like a level (bubble level bar, surface level or plumb-bob) and compass. And a smartphone doesn't even need sensors to be a display-based tool like a ruler or a protractor.
In Pictures: Swiss Army smartphone - 7 tools your phone can replace