Scanner

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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)

Other scanners