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What is the tachometer crown found on most watches used for?

In: Jewelry

[Edit]

Gigelush

It counts heartbeats.

First answer by ID1450823735. Last edit by ID1450823735. Question popularity: 15 [recommend question]

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Answers.com > Wiki Answers > Categories > Shopping > Fashion > Jewelry > What is the tachometer crown found on most watches used for?