Chekov and Captain Terrell survey a dynoscanner display

A dynoscanner was a sensor device used to detect low-level molecular activity.

In 2285, while scanning Ceti Alpha V in conjunction with Project Genesis, the USS Reliant detected a minor energy flux reading on one of the ship's dynoscanners, leading the crew to believe that the scanner was out of adjustment, that it contained life, or that a particle of preanimate matter was caught in the matrix. (Star Trek II: The Wrath of Khan)

While attempting to pinpoint a chlorinide leak in the cargo bay of the USS Enterprise-D in 2368, Geordi La Forge suggested the use of a dynoscanner, rather than a tricorder, because the tricorder was not picking up what it was they were seeking. (TNG: "Ethics")

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