Universal single-claw vernier caliper

The utility model relates to the technical field of vernier calipers, and discloses a universal single-claw vernier caliper, which comprises a main scale, a first spirit bubble, a second spirit bubble and a third spirit bubble are sleeved in the main scale, a rotating rod is bolted on the front surface of the main scale, and a rotating shaft is bolted on the back surface of the rotating rod. The surface of the rotating rod is sleeved with a pointer, angle scale marks are printed on the front face of the main ruler, and a through groove is formed in the main ruler. According to the utility model, vertical horizontal adjustment can be carried out through the first horizontal bubble, then transverse horizontal adjustment is carried out through the second horizontal bubble, and 45-degree horizontal adjustment is carried out through the third horizontal bubble, so that various horizontal adjustments can be effectively carried out; according to the utility model, an angle line is clearly seen through the through gr