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The Tandoka Scale was a scale used by migrant Bees from Melissa Majoria as carrier signals.
File:Tandoka Scale.jpg
The Tandoka Scale as used by the migrant Bees escaping the Medusa Cascade.
When the Earth was stolen, the Bees used the Tandoka Scale to travel home. The Tenth Doctor was able to trace the signals and take the TARDIS to the Medusa Cascade. (DW: The Stolen Earth)