What is vernier calliper and what is it used for ?
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a measuring device that consists of a main scale with a fixed jaw and a sliding jaw with an attached vernier.
vernier calipers: measure external length or diamter, measure internal diameter and depth of a container.
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The vernier calipers found in the laboratory incorporates a main scale and a sliding vernier scale which allows readings to the nearest 0.02 mm. This instrument may be used to measure outer dimensions of objects (using the main jaws), inside dimensions (using the smaller jaws at the top), and depths (using the stem).
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