This simple online timer conveniently utilizes your web browser for time management. For medical students, it can be a terrific window to open during presentations. It could also serve as a terrific tool for study time management.
Here are some url shortcuts that may help you to make the most of e.ggtimer:
http://e.ggtimer.com/30 (defaults to seconds)
Check out NextUp for a more comprehensive approach to meeting time.