Set a timer for 3 hours with the 3-hour countdown timer with an alarm. Online Timer - https://timer.onlinealarmkur.com/en/...more.

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Use this timer to easily time 3 Hours. Fullscreen and free!

Tritium (from Ancient Greek τρίτος (trítos) 'third') or hydrogen-3 (symbol T or 3H) is a rare and radioactive isotope of hydrogen with a half-life of 12.32 years.

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Once activated, the timer counts down from 180 minutes (which equals to 3 hours) to zero, making it useful for various applications where strict time monitoring is needed.

Free, fun and easy to use 3 hour clock countdown.

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Tritium (3H) is widely used in life sciences research. A wide range of tritium-labeled compounds are available, at moderate specific activity, and forms with uniform labeling or selective parts of …