Micrometer reading just past half a millimeter: 5.51 mm

An example figure from the Length Reading Generator.

A micrometer holding a wire, reading 5.51 mm, with a magnified view showing the 5.5 mm mark just uncovered on the sleeve — A micrometer measuring a wire, with the thimble’s edge just past the 5.5 mm mark below the sleeve’s datum line, and the thimble’s 1st mark on the datum line. The reading is 5.5 + 0.01 = 5.51 mm. Missing the half-millimeter mark would give 5.01 mm, the common mistake.

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Answer key

Reading: sleeve 5.5 mm + thimble mark 1 × 0.01 mm = 5.51 mm

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