The Kao Corporation of Japan is developing a “smart hairbrush”, which can assess the damage caused by hair treatments such as dyes and bleaches.
The article about this hairbrush is halfway down the page, but worth a read — NewScientistTech.com.
Read the full damage-sensing hairbrush patent application, here.
Such a device (if easy to use for the consumer) could give you a way to get miniaturization mapping done on your hair. Innovation shows how well the human brain can tackle problems.