Online Stopwatch

Here's a site I use often with my students. It's an online stopwatch that is displayed on the screen to show students how much time they have to do something. I use it most often when they are having snack to let them visually see how much time they have left. The kids love to countdown and make sure their snack is all finished and put away before the alarm goes off.

http://www.online-stopwatch.com/countdown-clock/full-screen/