Literature on Digit Ratio is rapidly growing in Economics. Quite surprisingly we observe that
there is no consensus about how to make an accurate measurement in such a delicate task.
Along this brief document we offer some concise guidance of how to scan the hands using
digital scanners and provide a comprehensive guideline to make a reliable measurement of
the 2D:4D. Furthermore, we point out the most common imaging and measurement errors.
We also provide a number of hints aimed to avoid these errors that in some cases may cause