Pain glove
From Lexicanum
The pain glove (also referred to as a nerve-glove) is a type of torture device used by the Space Marines. It is a "glove" of electrofibre mesh suspended in a vertical shaft, covering the entire body with the exception of the head. It fits the body like an intimate second skin. The glove stimulates nerves to inflict the most agonizing pain throughout the body, without causing physical harm. The device ensures the individual is kept conscious throughout the ordeal by suppressing reflexes which cause fainting.
Certain Space Marine Chapters use the device to punish infractions. Space Marines are well used to pain, and the goal is for the marine to manage to see past the sensation to gain insight or even create a mental link to their chapter's Primarch.
The Imperial Fists, while their discipline is legendary, use the device especially extensively. One possible theory is that their use of the device is linked to their tendencies toward self-inflicted pain, and/or inspired by their Primarch Rogal Dorn's use of the device in his meditations.
The longest known amount of time that anyone has endured the pain glove at level tertius without going insane, is fifty-two minutes. By that time however, the pain will have been so burned into the nerves as to become permanent1.
