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vernier caliper

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vernier

 or vernier caliper

Instrument for making very accurate linear or angular measurements. Introduced in 1631 by Pierre Vernier (c. 1580–1637), it uses two graduated scales: a main scale similar to that on a ruler, and a specially graduated scale, the vernier, that slides parallel to the main scale and enables readings to be made to a fraction of a division on the main scale.

vernier caliper [′vər·nē·ər ′kal·ə·pər]
(engineering)
A caliper rule with an attached vernier scale.
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The main vernier caliper scale shown in the bottom photo allows measurement in either millimeters (mm, upper scale) or inches (lower scale).
Trouble Shooter by Karl Seyfert / Motor
Maudsley had working forms of the vernier caliper in the early 19th century, and Whitworth had his "millionth" micrometer in the 1860s.
Gauge blocks--a Zombie Technology by Doiron, Ted / Journal of Research of the National Institute of Standards and Technology
AGD was measured by the examiner using a Vernier calipers.
Prenatal phthalate exposure and anogenital distance in male infants by Swan, Shanna H. / Environmental Health Perspectives
 
 
 
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