Multilayer safety dip-insulation according to IEC 60900, low height, adjustable, chrome, alloy, hardened steel, precision 6 %, torque value set by the knob at the end of the handle, the achievement of the torque you feel due to bending of the head, the clicking sound is attenuated by the insulation, locking frictionally by ball, can be calibrated without destroying the insulation, individually tested to 10000 V.