Tricorder

A tricorder is a multifunction hand-held device useful for data sensing, analysis, and communication, with many abilities. Tricorder devices were originally designed by Vulcan scientists sometime during the 19th Century. Tricorders soon caught on to many other races to, such as Romulans and Klingons. Sometime after the federation was founded, Starfleet Research and Development designed their own version of the Tricorder, which was much more advanced than others at the time. Currently, there are Starfleet, Vulcan, Romulan, Klingon, Bajoran, Cardassian, Ferengi, and Dominion versions on the tricorder.

Psychotricorder
The psychotricorder is a Starfleet tricorder specifically programmed for a psychologist's use in analyzing a patient. This version of the tricorder scans specific brainwave patterns during questioning of the patient, and is helpful in diagnosis and treatment of mental ailments and disorders. It may possesses a hypnosis-assist subroutine, as well as subroutines for lie-detection and amnesia analysis.

Medical tricorder
This model is equipped with sensors and analysis software tailored for medical diagnostic purposes.

TR-530 Tricorder I
The TR-530 Tricorder I was designed in the year 2263. It was the first tricorder used by starfleet.