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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.photographertools

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

***精选对 http://gizmodo.com/5562674/ ***

如果你有兴趣，你也可以在此工具感兴趣的摄影师的现场工具。它有一个距离标尺使用地图和其他许多很酷的功能。
https://play.google.com/store/apps/details?id=com.yingwen.photographertools

屏幕尺子和相机的统治者。支持这两个指标和美国的单元。它可以找出一个对象的距离，高度和物体的大小，使用手机摄像头。只要打开相机上的标尺，站了起来，瞄准和瞬间得到的结果。

同时支持手机和平板电脑。

常见问题解答：

1。上网崩溃报告
2。取向：它始终工作在横向的所有相机的统治者，因为有一个错误在Android的早期版本，摄像头预览不起作用纵向