The invention provides an integrated multifunctional
caliber. The multifunctional caliper has inner caliper and outer caliper two states, and comprises a pair of caliper arms, which are symmetrically arranged and are in cross hinge through a rotation pin, wherein one section, at one side of the rotation pin, of each caliper arm is a clamping section, and the other section is a reading section. The end portion of each clamping section is provided with a caliper head, the included angle between which and the caliper arm is adjustable in the plane defined by the pair of caliper arms; the two caliper heads, the front ends of which are sharp ends, are symmetrically arranged; when the caliper heads tilt inwardly, the caliper is an inner caliper, and when the caliper heads tilt outwardly, the caliper is an outer caliper; the reading section is provided with a reading device for reflecting the length of the inner caliper and the length of the outer caliper; the caliper heads are rotatably arranged at the end portions of the clamping sections respectively; the two sides of the back end of each caliper head are respectively provided with a limit lug for limiting the caliper head from tilting inwardly and outwardly to an
extreme position; and the reading device comprises a bent ruler provided with a circular arc-shaped
kidney-shaped hole, and two guide columns movably arranged in the
kidney-shaped hole, wherein one guide column is connected with one caliper arm, and the two surfaces of the bent ruler are provided with scale marks corresponding to the length of the inner caliper and the length of the outer caliper respectively.