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The detronal scanner was a handheld device which could read and interpret the genetic structure of living tissue.
Dr. Toby Russell used a detronal scanner to manually scan the DNA of Worf's damaged spinal column during a surgery involving the genetronic replicator in 2368. The replicator had difficulties in reading the Klingon dorsal root ganglia, forcing the doctor to resort to the manual scan. (TNG: "Ethics")