The Ruma metal ruler + bookmark is a winner of Germany’s iF Design Awards 2019. A simple yet effective concept, it has three functions: to keep your place in your book, to measure lengths up to 15cm and to help you draw lines. The corners are rounded, so there’s minimal chance of damaging the pages of a book. There’s a handy clip to prevent the Ruma from slipping out. It is made from aluminium, so it’s robust and lightweight.