I have used this one and it is really easy to be familiar with. It really is easy to carry around and would not require that much space as it is just as small as your key. Though it is only applicable to one person, I would understand the setup as you would want to monitor personal records. I suggest though that you copy data and save them on a separate file so that you can track on your own as well. Some say that there are better logging methods but I think this one suffices.
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