Multilayer safety dip-insulation according to IEC 60900, special steel, alloyed, tempered, quick-change function at the touch of a button due to positive locking of the sockets with 50 KG holding force, chrome plated, precision ± 4 % of the taken measurement, adjustable through button at the end of the handle, you feel the desired measurement is reaching by the slight bending of the head, the accustic signal is muffled by the insulation, can be calibrated without destroying the insulation, individually tested to 10000 V.