plumb bob

plummet ( def 1 ).

1825–35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plumb bob
the weight, usually of lead, at the end of a plumb line; plummet

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The plumb bob accurately transfers measured points above the ground to
  comparable points on the ground.
The quadrant consisted of a triangular plate, the point of which was fitted
  with a plumb bob.
Verifies vertical and horizontal alignment of members using plumb bob and level.
The deflection of the vertical is the departure of a plumb bob's actual
  pointing from the ellipsoidal normal direction.
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