These adapters attach to normal wrenches, enabling users to perform accurate and safe tightening. i.e. cylinder heads. Features include digital to allow precise measurement of torque and angles, kocking keys, LEDs and buzzer for audio and visual indication. It has 9 presets and can be switched between Nm, inlb, ftlb, kgcm and degrees. The adapters also feature peak and track mode. Torque accuracy ± 3%, Angle accuracy ± 2°.