An inspector reads the "graduation that best matches a main scale graduation" to obtain the vernier scale caliper reading.
What is a caliper? What is its proper use?
An instrument used to gauge an object's dimensions is a caliper. Numerous caliper kinds allow you to read out a measurement on a dial, a ruled scale, or a digital display. Some calipers are as straightforward as a compass with points that face inward or outward but lack a scale.
With a caliper, you may measure depth, interior dimensions, and outside dimensions. Depending on the measurement you need to make, all you have to do is press the jaws on the thing you want to measure. The measurement can then be read, depending on the types of caliper you're using, on the scale, or on the display.
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