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Memory Alpha

The tricorder was used by Romulans from 2368 to 2371.

This tricorder was used by Romulan crewmembers aboard a damaged Romulan science ship in 2368. (TNG: "The Next Phase")

This was not explicitly stated to be a tricorder.

Sub-commander N'Vek used a tricorder to scan Deanna Troi for traces of a sedative. (TNG: "Face of the Enemy")

The Romulan tricorder in 2371

This tricorder was very similar to that of the Federation. It was much larger, but still featured touch interface control surfaces. A tricorder was recovered from the Amargosa observatory in 2371 and allowed the USS Enterprise-D crew to learn that the Romulans had been searching for trilithium stolen by the Duras sisters for use in Dr. Tolian Soran's trilithium weapons. (Star Trek Generations)

This tricorder was designed by John Eaves.