dermal denticles

How do you take these pictures and include a scale? These are excellent.

Thanks, RickNC! Ancient Bones, (my Mum), brought her finds to me when she came to visit. I photographed them using my old Sony Cybershot which has a really nice super macro setting. I photograph the finds with an physical scale, but I don't like what it looks like in a picture, so I replace it with a corresponding digital scale to match.