After trying out timers and stopwatches, both online and downloaded applications, I found one that is easy to use has uncomplicated options.

Online-Stopwatch has prevented many a meal here from being burned, though you can use it for anything - not just timing how long something needs to cook when you and your computer are in one place, and the kitchen is in the other.

It has big buttons that are easy to click, and the alarm is definitely an attention getter.
You need Flash installed or enabled to use it.

Online Stopwatch
Web Application

Signing off,
Rhiannon

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