Abstract: A device for measuring the amount of tensile force required to remove a roof fastener from a roof supporting structure. The device includes a base, a sliding parallel shaft assembly, a hydraulic cylinder, and a threaded screw. The lower end of the sliding shaft assembly engages the head of the fastener. The threaded screw threadably engages the upper platform of the sliding shaft assembly, and has a lower end biasing upon the piston of the hydraulic cylinder. As the threaded screw tightened downwardly, the lower end of the screw pushes the piston downwardly such that the fluid within the cylinder is compressed. Simultaneously, the sliding shaft assembly is drawn upwardly such that a tensile force is applied to the fastener. A pressure gauge determines the pressure level within the cylinder, which, by calibration of the like, may be used to determine the amount of tensile force exerted upon the fastener.