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the New Sonic Screwdriver has a read out on it, apparently. Even as far aback as Moffat's first episodes for the 9th Doctor, "The Empty Child" and "the Doctor Dances" the Doctor has been able to use the screwdriver as a medical scanner and to, among other things, mend barbed wife.

It probably has some kind of display that shows what the Screwdriver has scanned.