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A bio-damper was a device which could be as small as a ring, that masked the bio-signature of an individual. However, they were ineffective against Huon particles. (TV: The Runaway Bride)
History
The Tenth Doctor gave Donna Noble a bio-damper so that she would be hidden from the Racnoss. He later realised it was ineffective against tracing the Huon particles inside her. (TV: The Runaway Bride)
Martin Trueman had a bio-damper to hide the fact he contained the Ancient Lights inside him. (TV: Secrets of the Stars)
In 2010, Gavin wore a bio-damper ring he inherited from his father which hid his alien origins. (TV: The Empty Planet)
A bracelet worn by Ruby White incorporated a bio-damper in order to disguise her Qetesh biology. (TV: Goodbye, Sarah Jane Smith)