Surveying
Assuming human normal vision distance 25 cm, smallest measurable angle 20", and intraocular distance 6.5 cm, the smallest depth to be discerned is

1.1 mm
0.1 mm
1.00 mm
0.5 mm

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Surveying
The length of a chain is measured from

outside of one handle to inside of other handle
outside of one handle to outside of other handle
centre of one handle to centre of other handle
inside of one handle to inside of other handle

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