What is the least count of a standard metric micrometer depth gauge?
0.01 mm
A standard metric micrometer, including the depth-gauge type, has a thimble divided into 50 equal divisions and a screw of 0.5 mm pitch.
One full thimble rotation advances the spindle by 0.5 mm, so each thimble division equals 0.5 mm divided by 50.
That gives a least count of 0.5 / 50 = 0.01 mm, the smallest measurement the instrument can read directly.
Values like 0.1 mm or 1 mm are too coarse for a micrometer, and 0.001 mm needs a vernier micrometer, not a standard one.
Hence, the answer is 0.01 mm.
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