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Dial Calipers
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The dial caliper is a variation of the vernier caliper that uses a dial scale instead of a vernier scale. A dial caliper can be faster to read than a vernier caliper. If you are familiar with the vernier caliper, the main body of the caliper has a millimeter or inch scale and the sliding part of the caliper has a vernier scale to measure to the hundredth of a millimeter or inch. The dial caliper still uses the main scale to measure to each millimeter or inch but uses a gear to turn a dial to measure to the hundreth of a millimeter or inch.
The image below shows an example dial close up.
As you can see, this dial measures with an accuracy of a thousandth of an inch. The pointer on the dial is less than 1/8 and more than 7/64 so you know the measurement reading should be less than .125. and greater than .11, but closer to .125. In the green circle, we can see the pointer lines up with .12 inches.
In this image, it shows an example of a metric dial. The front of the sliding jaw passes the 15m mark and the pointer of the dial is between the 2nd and 3rd mark after .4mm indicating the hundredth value is between .02mm and .04mm because each march is .02 mm. Therefore, we can see that the pointer value is .43mm. The total measurement is 15.43mm.
The digital caliper is another common caliper like the dial caliper but gives you a digital readout instantly.
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