Yep! Does the Trick.

I used it to take a picture of a credit-card on a box from straight-up, and then could use that space relation to measure the whole box. For USPS ClicknShip. If I knew where the measuring tape was itd be faster. But given that I was temporarily
at a loss and didnt feel like looking for it, well there you go! Thanks! Great invention.

m3rlinO about RulerPhone - Photo Measuring