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1.4 Measurement, Calculations, and Uncertainties
Vernier Caliper Tutorial
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Explanation:
The Vernier caliper is a standard method used in instruments to get   higher precision readings. As discussed in Section 1.4, the method used in making a measurement determines the accuracy with which the numbers are reported. This simulation allows for a reading to the tenth of a mm. Calipers commonly used in industry provide an accuracy to the hundredth of a mm.
 
Source:
Fu-Kwun Hwang