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A Trill diagnostic tool is a medical instrument used by Trill to check on the status of their symbionts.

In 2367, the host of Odan used this tool to scan his symbiont. The symbiont reacted by pushing outwards beneath the skin. (TNG: "The Host")

It is unclear what this tool actually does, how it stimulates the symbiont, or whether it has healing properties. The script of the episode states: "Odan takes a device from the counter, aims it toward the bulbous protuberance, and envelops it in a spray of light. The growth throbs there for a moment, then begins to recede again. Whatever it is, Odan has just fed it, and it is content once more."

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Trill diagnostic tool

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