What's this small pen-like thing attached to my Nissan Micra's keyring?

I have a Nissan Micra 2001 1.3 SE. The keys came with with a small pen-like thing - I dont know what this is for?

Asked on 5 August 2010 by tripey1

Answered by Honest John
I guess this is something added to the ring by a previous owner. Might be a tyre pressure gauge or a tyre tread depth gauge.
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