The Torpedo SDMT set is used to perform SDMT measurements downhole using a drill rig. It is composed of five parts: (1) One upper Torpedo Adaptor for connecting drill rods to penetration rods, with a hole, a channel and an outer ring for the exit and the protection of the pneumatic electric cable. (2) Three 1 m rods (ɸext 50 mm) (3) Two rod nipples for connecting 1 m rods (ɸext 50 mm)  (4) One lower adaptor for connecting 1 m rods (ɸext 50 mm) to the SDMT probe  (5) One Torpedo extendable cable of 3.8 m.