Too Sensitive!!! – Photo Ruler ABC - Measure your world Review

I'm not planning to measure the distance between Earth and Venus for a space mission... I'm looking for an approximate size of an object! Setting the reference measure is a royal pain, even when using the "standard" measures (CD, iPhone, credit card, and the always popular A4 paper!). Please go back to the drawing board!
Review by Ciclowiso on Photo Ruler ABC - Measure your world.