3 Mile Pencil has simple odometer
Unlike most writing instruments, what you're really buying when you purchase the "3 Mile Pencil" is the packaging, calibrated to show exactly how many miles of lead you've scratched out as well as the number of words. It's a cute idea, but somehow I suspect it's just a regular pencil, so taking a glance at the packaging should give you the same rough estimate for your favorite lead slinger.
It's £1.75.
Catalog Page [GenieGadgets.com via Oh Gizmo]

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I totally read that as 3 Mile Island Pencil… And was totally let down.
Pardon my poor English, but didn't you mean "podometer" to measure distance (as opposed to "odometer" which would rather be about measuring smell)?