Best Sand Timer
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This iPad app can help keep track of elapsed time for quizzes, tests, etc. It's also useful for group work and discussions.
The digitized hourglass can be used to time anything for up to an hour. You can customize the hourglass by changing time, color, and looping sounds. If you set the alarm, the sound plays when time is over. It's got a kitschy, retro quality to it.
The downside to this free app is the ads, which can be irritating and distracting. Spend 99¢ to get rid of the ads.