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Simple cursor rule
On the 125mm vernier caliper's main and auxiliary ruler legs, the self-made tripod and the stylus are installed, which is a very practical simple cursor rule, as shown in the figure. The advantages of the rule: 1 using the vernier ruler to size, as long as the tripod and the stylus are made well, the size error of the circle can be equivalent to the accuracy of the vernier caliper. 2 can directly move the sub-size. 3 The stylus can be moved up and down, and it is convenient and accurate to round or divide the line segment of the convex or concave concave or convex part. 4 This rule can also be measured for workpieces whose distance between two points is not well measured.