Code disc auxiliary reading vernier caliper

The vernier caliper comprises a caliper body and a vernier scale, the vernier scale is sleeved on the caliper body, the inner side of the vernier scale is provided with a centimeter code disc and a millimeter code disc, and the vernier scale is provided with two windows for displaying centimeter reading and millimeter reading. An upper protruding rib and a lower protruding rib are arranged on the surface of the ruler body, the rib on the upper side is provided with an upper rack connected with the millimeter code disc, and the rib on the lower side is provided with a discontinuous lower rack connected with the centimeter code disc. A first gear meshed with the upper rack is fixed on the millimeter code disc; a second gear meshed with the intermittent lower rack is fixed on the centimeter code disc; according to the vernier caliper for auxiliary reading of the code disc, the centimeter number and the millimeter number are directly displayed through the numbers on the code disc, reading is more convenient, ener