Why does Miki keep pulling out a stopwatch? I'm currently on episode 10 of Revolutionary Girl Utena, and I've noticed that at certain points someone (most likely Miki, if I'm not mistaken) will pull out something that looks like a stopwatch or a counter. (This happens in the beginning of episode 10 when the Student Council is discussing the next duelist, and also happens earlier in some of the points concerning Nanami.) Some sort of clicking sound will accompany this.



But I'm not really sure what this is supposed to signify (if anything). Is Miki counting something, or is this supposed to just set the tone for something? If so, what is this "something"?

Update: In episode 11, Miki pulls out a stopwatch again after asking Touga if he's just treating his sister like a pet (in the translation I was watching) and states a "time" of 6.54 seconds. But I'm still not sure what he's counting. Afterwards, the discussion immediately goes back to Nanami's loss to Utena.
Yes, it is a stopwatch. Ikuhara Kunihiko (Director/Producer, Storyboards, Original Concept) answered this question in an Animage interview with Be-Papas, the animation studio that created Utena:
Translation by a fan:

Animage magazine: The next question came up most often.
Question: What does Miki measure with his stopwatch? (reader from Hokkaido)
Ikuhara: Let’s just say that it’s connected with the structure of the world.
All: (laugh).
Enokido Yoji (Animation Composition, Chief Screenwriter): That’s a really hard-to-understand answer.