Exographic targeting sensor
An exographic targeting sensor was a head-mounted sensor capable of visually penetrating almost any surface allowing its user to literally see through walls. Its range could be adjusted to allow the user to see up to only a certain point. 

In 2375, Lieutenant Chu'lak used an exographic targeting sensor to locate his murder victims. ()

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Sensor technology
de:Exographischer Zielerfassungssensor