A vernier scale, named after Pierre Vernier, is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation, which increases resolution and reduces measurement uncertainty by using vernier acuity. It may be found on many types of instrument measuring length or measuring angles, but in particular on a vernier caliper, which measures lengths of human-scale objects.

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Facts from Wikidata (CC0). Image by Lookang many thanks to Fu-Kwun Hwang and author of Easy Java Simulation = Francisco Esquembre via Wikimedia Commons (CC BY-SA 3.0).

Vernier scale

auxiliary scale of a measurement device, that aids to increase measurement precision

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