Measuring principle of vernier caliper
There are only 10 divisions on the vernier scale, which is formed by dividing the 9 divisions on the main scale into 10 equal parts. Therefore, the interval of one division on the vernier scale is equal to that of one division on the main scale. See Figure 1-3 for a measurement diagram.
That is, the length of the object is equal to 7.6 main scale divisions. If each division of the main scale is 1mm, the length of the object being measured is 7.6mm.
When using a vernier caliper for measurement, the reading is divided into two steps: (1) Read the whole division of the main scale from the zero line of the vernier.
(2) Read the decimal number less than one division based on the scale line on the vernier that is aligned with the main scale. The sum of the two is the measured value.
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