Hi, I have been searching for a reset or recalcuate normals tool and I have come across plenty of fourms and threads but none with what im looking for.

When I dupliacated my mesh the duplicate had some inverted normals and after looking at the normals editor the normals all look very messy. Is their a way to recalcuate (reset) the normals like in other softwares?

If you require a print screen please let me know.
Thanks in advance.