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Tachymeter:
also called a tachometer,
measures the speed of travel
over a given distance. It is
frequently used to determine
the speed of a car over a
measured distance.
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Diver’s Scale:
mainly found on the
turning bezel of a dive watch, it
allows a diver to track the time
elapsed while submerged under
water. It is sometimes found
beneath the watch crystal and
can be turned by a pusher at
the 9 o’clock position.