📏 Vernier Callipers — MSR, the coinciding division, and the reading

The vernier scale packs N divisions into (N−1) mm, so each is a shade short of a millimetre. That shortfall is the least count. Slide the jaws and read the object.

Walkthrough 1 / 1

The complete picture.

Object size D 12.40 mm

Vernier divisions N 10

L.C. = 1 MSD / N · reading = MSR + (VC × L.C.)
MSR = 12 mm · VC = 4 · L.C. = 0.10 mm

reading = 12.40 mm (equals the object size)

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