Tricorder is a noun.

Though it is a fictional universe, a number of technologies introduced in the series have gone from fantasy to reality. Communicators, phasers, the hypospray, tractor beams, transparent aluminum, universal translator, telepresense, and the medical tricorder are good examples of items that you can find today.

In the fictional universe of Star Trek, people use tricorders. A tricorder is a multi-functional hand-held device used for scanning, data analysis, and recording data.

These are not worth much im afraid, between £3 - £10 depending on condtion. They tend to get better prices from the avid collectors in conventions. (US: $5 - $15)

Chengalpattu Medical College, Chengalpattu
Christian Medical College, Vellore
Coimbatore Medical College, Coimbatore
Chennai Medical College, Chennai
Madurai Medical College, Madurai
Government Kilpauk Medical College, Chennai
Stanley Medical College, Chennai
Thanjavur Medical College, Thanjavur
Tirunelveli Medical College, Tirunelveli
Rajah Muthiah Medical College, Annamalainagar
P.S.G. Institute of Medical College, Coimbatore
M.K. Medical College, Salem
Shri Ramachandra Medical College and Research Institue Porur, Chennai