Detector

''This article describes the unit type. For information on the device, see here.''

A detector is a building or unit that is able to detect and thus unmask cloaked or burrowed units. Detectors can be stationary (buildings) or mobile (units). Once a detector uncovers a cloaked unit, any friendly unit can fire on it. This capability is especially critical when faced with a ghost targeting a nuclear missile or an arbiter providing cover for a number of units. Detector units trapped in Lockdown or hit by Optical Flares will lose their ability to detect.

StarCraft
Detectors include:

Protoss
 * Observer
 * Photon cannon

Terran
 * Scanner Sweep (ComSat station ability)
 * Missile turret
 * Science vessel
 * Spider mines can sense and attack cloaked ground units. Mines do not reveal cloaked units, however.

Zerg
 * Overlord
 * Spore colony

Non-Buildable Detectors
These detectors can not be built/transformed/warped by any worker unit.

Terran
 * Traps

Zerg
 * Cerebrates
 * Overmind
 * Second Overmind

StarCraft II
Detectors include:

Protoss
 * Observer
 * Photon cannon

Terran
 * Scanner Sweep (Orbital Command ability)
 * Raven

Zerg
 * Overseer
 * Spore crawler