Common vernier calipers can be divided into three kinds according to their accuracy: namely, 0.1 mm, 0.05 mm and 0.02 mm. Vernier calipers with accuracy of 0.05 mm and 0.02 mm. Their working principle and using method are the same as the vernier calipers with an accuracy of 0.1 mm introduced in this paper. A vernier caliper with an accuracy of 0.05 mm has 20 equal marks on the vernier for a total length of 19 mm. When measuring, if the eleventh scale line on the vernier is aligned with the main ruler, the reading of the decimal part will be 11/20 mm =0.55 mm. If the twelfth scale line is aligned with the main ruler, the reading of the decimal part will be 12/20 mm =0.60 mm.
Preservation methods
After using the vernier calipers, wipe them clean with cotton yarn. When not used for a long time, it should be rubbed with butter or oil, the two measuring claws close and tighten the fastening screws, and put them into the caliper box to cover well.
The vernier caliper has 4 minimum reading values: 0.1 mm (10 scale on the vernier), 0.05 mm (20 scale on the vernier), 0.02 mm (50 scale on the vernier) and 0.01 mm (100 scale on the vernier)
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