Abstract: A device for the continuous measurement of the jacket thickness on a cable, comprising a body and a mounting arm. The body has at least two spaced sensors one in advance of the other and providing a lower bearing surface of the head, the body carrying a flexible diaphragm assembly. The mounting arm has one end portion fixable to a base and the other end portion fixed to the head through the diaphragm assembly. The mounting arm lies in the plane of the sensors and extends obliquely from the head with respect to the lower bearing surface of the head and is laterally resilient. The arm is constructed and arranged whereby the head is movable substantially perpendicular to the plane of the lower bearing surface of the head when the arm is fixed to the base.