Magnifying Glass

The Magnifying Glass was what Link managed to find when he inserted the scale from the mermaid's tail who lived in Martha's Bay into a mermaid statue in that same locale. The Magnifiying Glass was used by Link to find creatures that weren't normally visible to the human eye. This gave him access to a creature in Toronbo Shores that he could trade an item with for a boomerang. The Magnifying Glass was only found in Link's Awakening.