Zora Scale
The Zora Scale is an item in Oracle of Ages and Phantom Hourglass.
In Oracle of Ages, the Zora Scale is given to Link by a Zora after Link defeats Plasmarine and gets the Rolling Sea from Jabu Jabu's Belly. It is used for two things. First, it is needed to get into the Sea of Storms. Also, when Link gives the Zora Scale to the Skull Pirate captain, Link gets the Tokay Eyeball.
In Phantom Hourglass, it is a sparkling treasure that can be sold on Mercay Island to the Teller of Treasures for a fixed, random amount of Rupees. It is also a highly valued commodity among members of the Ho Ho Tribe.