MenuTimer

MenuTimer is an easy-to-use timing utility that lives in your Mac's menubar. It allows you to quickly monitor tasks with millisecond precision right from the convenience of your Mac's menu bar!

Features:

• Fast startup and minimal memory usage
• Millisecond precision
• Persistent timer. You can quit the application, restart your Mac, even upgrade your OS and the timer will keep going. The timer keeps going even when the application is in the background, without consuming battery.
• Ability to keep a log of previous runs
• OS X 10.6 or later support