The Cuff Caliper is a calibration device designed to indicate the diameter of a pair of handcuffs or other restraint devices. Handcuffs or restraint devices have fixed points. These fixed points are directly proportional to the diameter of the restraint device. The Cuff Caliper is designed to indicate at what fixed position the handcuffs are currently in. In short, the Cuff Caliper is a device in which the position of the handcuffs or the diameter of the handcuffs can be easily identified.