*** Featured on http://gizmodo.com/5562674/***

*** If you are interested in this tool, you may also be interested in Photographer's Field Tools. It has a distance ruler using map and many other cool features.
https://play.google.com/store/apps/details?id=com.yingwen.photographertoolspro

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Both a screen ruler and camera rulers. Support both metrics and US unit. It can find out an object distance, height and the object size using the phone camera. Just turn on the camera ruler, stand up, aim and get the result instantly.

Supports both phones and tablets.

FAQ:

1. Internet access is for crash report
2. Orientation: It always works in landscape orientation in all camera rulers because there is a bug on android early versions that the camera preview doesn't work in portrait orientation