Plumb bob and plumb rule

The left example is a plumb bob, and the right example presumably a plumb rule¹. Both are rare², of New Kingdom, and should be in the same category than the Carpenter’s set-square and the plummet

Blue glazed plumb rule?
pierced for suspension
H 2.2, W 0.8, T 0.3
End of Dynasty 18, reign of Ay
The Oriental Institute of the
University of Chicago #E16533

References

¹See the description of The Oriental Institute of the University of Chicago #E16533
²None, Unpublished amulets