How Vernier Scale Works

An Intuitive Understanding

circuit4u

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Before the days of digital calipers with LCD display, one learns how to read the Vernier scale on a metal caliper directly. There are still tutorials teaching how to read such a metal caliper correctly.

Once you learn how to use the aligned number on the Vernier scale to read out sub-millimeter, have you wondered why does it work like that?

To gain an intuitive understanding, let’s start with the zero position of a caliper (with sliding Vernier scale in yellow):

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circuit4u

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