The species matcher was a device capable of identifying the species of an individual by their image. The Doctor got one as a gift from his godmother. Its mirror was smashed when the Eleventh Doctor was looking for a Krafayis. (TV: Vincent and the Doctor)
Using a direct image or a picture, the system was capable of identifying a species. Though it was capable of using drawings, it would be less accurate. It would give the species' name, planet of origin and other important information. It could connect to the TARDIS to print out the information, or be carried by the user to give information on a mirror screen. It also had the ability to recognise the Doctor, even if he had regenerated, as it printed pictures of the First Doctor and Second Doctor. If the identification was incorrect, it would respond to oral instructions to reassess. It had the ability to show a creature even if it was invisible. (TV: Vincent and the Doctor)
Behind the scenes
The device was never named on-screen.