He can and does--he's pretty quick on the draw with the thing, from long experience. And it's not like he needs to take a deep tissue scan and full genetic profile. Though from what he sees, he sort of wishes he was--what the tricorder is picking up is fascinating. His body temperature is worryingly high, higher even than a Vulcan's, but he doesn't seem to be suffering any ill effects for it--any normal human, even enhanced ones like himself, would have been dead from such high temperatures.

It's actually somewhat amusing and/or endearing to see Wan so fascinated with something anyone from this century would take completely for granted.

"Careful you don't do that with one that has something in it," he says cheerfully. The empty one isn't going to do any harm, but one that had a cartridge might.