sweep hand

noun Horology.
a hand, usually a second hand, centrally mounted with the minute and hour hands of a timepiece and reaching to the edge of the dial.


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World English Dictionary
sweep hand
horology a long hand that registers seconds or fractions of seconds on the perimeter of the dial

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
If your meter doesn't have a flow indicator, you can use the sweep hand on the
  register to indicate water loss.
The sweep hand indicates that the meter is functioning.
The sweep hand simply records information to the one tenth decimal place.
Write down the reading on the meter and the position of the sweep hand.
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