Custom html module to show on individual products

I would like to find out how to have a joomla custom html module to only show on individual product pages within a category.

for example: I have a ladies wear category, and i want a ladies size conversion table(in custom module) to show when the user views any product within that category.
I have a different size conversion table for each different category and I only want them to show when in that category?

The module must only show on the individual product page. They must not show on the categry listing pages

Any help would be appreciated.

Thanks!