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In my experience, industrial timers like these are very loud; I've used them for darkroom photograph...
posted 2011-10-23 13:53:56 in reply to Where can I find a good mechanical timer?
If you'd like something that is integrated with your mechanical pencil, I love the Pentel Twist-Eras...
posted 2011-10-02 17:14:34 in reply to What's the best pencil eraser?