High-precision natural marble V-shaped block for measuring and calibrating precision of V-shaped groove

The utility model discloses a high-precision natural marble V-shaped block for measuring and calibrating the precision of a V-shaped groove, which comprises a mounting block, a first mounting groove is formed in the outer side of the mounting block, a mounting box is fixedly mounted on one side, far away from the first mounting groove, of the mounting block, and a mounting cylinder is slidably connected in the mounting box. The length measuring device has the advantages that the structure is compact, the operation is simple and convenient, the practicability is high, the length of an object to be measured can be efficiently measured through the arrangement of the scale marks, the measurement accuracy is high, and the measurement precision is high. The position of the device can be better limited by arranging a first anti-skid pad, the levelness of the device can be better adjusted by arranging a gradienter, the use safety of the device can be better improved by arranging the outer side of a mounting block to