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vernier caliper

a caliper formed of two pieces sliding across one another, one having a graduated scale and the other a vernier.
Also called vernier micrometer.
1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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vernier-micrometer in Science
vernier caliper
A measuring instrument consisting of an L-shaped frame with a linear scale along its longer arm and an L-shaped sliding attachment with a vernier scale, used to read directly the dimension of an object represented by the separation between the inner or outer edges of the two shorter arms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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