Sensor Type

A Sensor is a type of ninja who is capable of detecting the presence of other people through their chakra. A skilled sensor can detect their targets from a great distance, as well as differentiate the characters by their signature chakra alone. Such examples include Karin being able to tell exactly who is among a crowd of people, and Fū can tell that a sensor type is amongst the intruders. Some of these sensors can be good enough to tell if their targets are lying based on any fluctuating chakra.

Sages, who utilize natural energy, can also detect presence of people through their chakra, making them somewhat like sensors. Also, Kisame Hoshigaki's great blade, the Samehada, is attracted to intense chakra, allowing him to hunt down such individuals.