Of all the tricorders that have been used on Trekdom, what's your favorite? Mine's the mark X science tricorder.
Future "made from an alarm clock" 29th century (episode Relativity, i think). Because I have that clock, converted to a tricorder.
I'd say the Voyager/First Contactish era. I thought the Nemesis version was a little bland considering it's previous style.
The TNG standard tricorder, because I always wanted the Playmates toy tricorder as a child http://www.youtube.com/watch?v=iQEAtHMZcaw
The Vulcan scanner will always have a place in my heart. As was I. I stumbled upon my old starships and all of them are missing their nacelles.
Really. The original Tricorder by Wah Chang is king of all tricorders. Especially when (rarely) seen in action(City,Plato,Arena). It even explodes!