Telescope

The telescope is an item Link's sister, Aryll, gives Link in the beginning of The Wind Waker as a birthday present. Although she says she'll let him borrow it for one day only, he ends up keeping it for the rest of the game.

It is with this telescope that Link notices Quill looking up at the sky at the giant Helmaroc King kidnapping the pirate Tetra, and it is also the only time the telescope is truly needed to advance in the game.

In Phantom Hourglass, one telescope (that turns out to be kaleidoscope) can be received from Imposter Link, who jokingly says he borrowed it from his sister as a reference to The Wind Waker. The telescope is then returned to its owner, a member of the Ho Ho Tribe.

Trivia

 * Zuko, one of Tetra's pirates, also has a telescope, very much like the one Link gets from Aryll.
 * Pink "scout" Bokoblin out on the Great Sea have a similar form of telescope that they use as weapons. Strangely, enough if a pink Bokoblin picks up a weapon, it holds both its telescope and weapon in the same hand.
 * Old Man Ho Ho also has a kaleidoscope which looks similar to the telescope from the outside.