And you are going to love your tricorder! I am going to have to change my batteries soon because I have played with it so much. (I guess I need to get one of the new tricorders for my costume. I just wish they didn't look so crappy.Maybe I could make some modifications... hmmmmm)
Just use the TOS one. The one McCoy puts on when he first gives Kirk the Mulvarian mud vaccine looks just like the TOS ons.