A Dalek uses a seismic detector on Aridius. (TV: "The Death of Time")

The seismic detector was a piece of Dalek technology which let them locate people, (TV: Mission to the Unknown) machines such as the Doctor's TARDIS (TV: The Chase) or materials such as taranium. They were used as an attachment to the manipulator arm. (TV: The Daleks' Master Plan)

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