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I have found tools like Smart Ruler that helps us measuring length using the screen. But for objects bigger than the screen I imagine there are apps that use the camera and focal length to show distances and widths. If there's no such app, is it possible to use a camera or any other common phone hardware to measure spatial dimensions?

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up vote 0 down vote accepted

I just found an app from the same developer that does what I wanted for buildings

Smart Measure

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They also have an app called smart distance. – Ryan Conrad Mar 26 '12 at 13:40

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