Vernier caliper is a measuring tool for measuring length, internal and external diameter and depth.The vernier caliper consists of a main ruler and a sliding vernier attached to the main ruler.The main ruler is generally in mm, and there are 10, 20 or 50 divisions on the vernier. According to the division, the vernier caliper can be divided into ten division vernier caliper, twenty division vernier caliper, fifty division vernier caliper, etc. The vernier caliper with 10 divisions is 9mm, 20 divisions is 19mm, and 50 divisions is 49mm.There are two pairs of movable measuring jaws on the main ruler and vernier of the vernier caliper, which are internal measuring jaws and external measuring jaws. The internal measuring jaws are usually used to measure the inner diameter, and the external measuring jaws are usually used to measure the length and outer diameter.
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