Convenient-to-use female end diameter measurer

The utility model belongs to the technical field of measuring tools, particularly relates to the field of G01B5/08, and specifically relates to a female end diameter measurer convenient to use. The utility model provides an inner spigot diameter measurer convenient to use, which is characterized by comprising a sliding block, a fixed block and a meter fixing block, the sliding block and the fixed block tend to be away from each other, and the meter fixing block is arranged on the other side, opposite to the fixed block, of the sliding block; an adjustable sliding measuring head is fixedly arranged on the sliding block, and an adjustable fixed measuring head is fixedly arranged on the fixed block. According to the utility model, the spring influencing the measurement precision is arranged in the cavity of the ruler rod, the spring is sleeved on the rod part of the sliding screw, and the two end parts and the two end face structures of the spring are fixedly connected, so that the spring is protected in all dir