Eleazar

Eleazar is a vampire from Twilight.

Abilities
Ability Identification: Eleazar has the gift to identify the type and strength of other gifted vampires. Eleazar thinks that it is a "haphazard practice," as no two abilities work the exact same way. His ability to read powers is, like many other gifts, weaker on humans and so is limited in that sense and requires full concentration for him to detect their powerful gifts. Eleazar is the one who helped to discover Bella's own gift, though his power is being repelled by it. However, his power seems to run on a different frequency as he can feel it being blocked by Bella's shield, rather than not feeling Bella's gift at all.

His ability is what earned him a place within the Volturi in the first place, as Aro found it useful for determining if his enemies were gifted and for finding vampires or humans throughout the world that might be special enough to be invited to the coven.