Professional tool for commercial or occasional use. This tool is used to gauge degree of turn when manufacturer calls for fasteners to be tightened further after torque loads are applied. Useful when vehicle manufacturers are specifying both torque and angle settings. Easy to read dial gauge. Calibrated in degrees (0 360). Marked in 2 degree increments and 30 degree intervals. Easily zeroed for next application by turning the tool housing. Adjustable arm keeps angle scale stationary. 1/2 square drive so will fit any 1/2 ratchet / torque wrench / power bar etc... 1/2" male and female square drive and an adjustable holding rod hold the gauge in position during use.