Pitch-row comparative measurement instrument

The invention provides a pitch-row comparative measurement instrument and belongs to the field of measurement instruments. The pitch-row comparative measurement instrument comprises a pitch-row tolerance reading device, two locating devices and a locating fine-adjustment device, wherein the relative distance between the two locating devices can be adjusted, the pitch-row tolerance reading device is fixedly connected with a fixing base, one locating device is fixedly connected with the locating fine-adjustment device, and the other locating device and the locating fine-adjustment device are both movably connected to the fixing base. In the process of measurement, a piece to be measured is fixed through the two locating devices, and the linear movement distance of the locating fine-adjustment device relative to the fixing base is displayed through the pitch-row tolerance reading device. After a standard piece is adopted, comparative measurement can be conducted through the pitch-row comparative measurement inst