Caliper for calibrating flange perpendicularity

The utility model provides a caliper for calibrating flange perpendicularity. The caliper is characterized in that a flange is connected to one end of a tube; the caliber body is clamped and fixed between the outer wall of the tube and one side of the flange; the caliber body is connected with a folded plate through a bolt; an stretchable plate is connected to the lower part of the folded plate; and the caliber body is provided at a cloud line part with a spacing stop port. The caliper for calibrating flange perpendicularity provided by the utility model has good practicability, wide application range, and low manufacturing cost, and is convenient for measuring the connection state of the tube and the flange. The caliber is suitable for instrument applications for measuring the perpendicularity when a pipeline system flange is connected with a pipeline.