Scanners were devices used by many species, such as the Time Lords, humans and the Judoon, to gather information.

Sarah Jane Smith had a scanner watch, which was capable of detecting alien life and identifying the species and its origin. (TV: Invasion of the Bane, Enemy of the Bane)

River Song also had a scanner, which was made by Magpie Electricals and she used to open locked doors (TV: The Impossible Astronaut) and discover that the astronaut suit that her younger self had escaped from was augmented with alien technology. (TV: Day of the Moon) It also functioned as a medscanner. (TV: Flesh and Stone)

Known scanners or types of scanners included the TARDIS scanner, the Doctor's sonic screwdriver, Bekaran deep-tissue scanners, data scanners, Judoon scanners, micromeson scanners, time scanners, genetic scanners, Gregor Van Baalen's scanner, holographic scanners, infrared scanners, life scanners, Sidelian Brain Scanners, space scanners, temporal scanners, Vetlox scanners and the Zookeeper's scanner.

Bronze Daleks used visual scanners and listening scanners. (PROSE: Birth of a Legend)

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