The correct spelling would be vernier callipers, or vernier calipers depending on which country you come from. They are used for measuring the inner distance between two surfaces. (e.g. if your tube material is 1 cm thick, and 5 cm across on the outside surface, the vernier calipers would show a distance of 3 cm.
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A caliper is a device used to measure very small lengths of the order of one tenth of a mm and micro meter ie one thousandth of a milli meter. Such a device was first designed by Vernier. Hence the name. Though a milli meter gap cannot be divided into equal parts using an additional scale such a division could be done virtually. Thanks to Vernier.
Vernier Calipers are instruments that are used measure length. It is an instrument that provides a digit of accuracy.
Vernier Caliper are made with different materials even plastic vernier calipers are also available in market however generally stainless steel is used in making of vernier calipers
A Vernier caliper has many parts. Some of the main parts include an inside jaw, which performs measurements, the depth probe, which finds the depth, and outside jaws, which measure external lengths.
Micrometer is having a ratchet to rotate which is pre-loaded to get standard thrust while measurement, whereas in the case of a vernier the accuracy of measurement depend on the pressure each individual applying while the measurement.
Former i.e. Vernier Caliper