. . "Laser screwdriver"@en . "The Sound of Drums"@en . . . . . . "Laser screwdriver"@en . . . . . . "Multi-functional laser weapon"@en . . "Incorporating various technologies, including a miniaturised system based on the age-regression technology developed by Professor Richard Lazarus, the laser screwdriver was powered by an Artron crystal taken from the Doctor's TARDIS. (Doctor Who DVD Files) The laser screwdriver had isomorphic controls so only the Master could operate it. This was revealed when the Doctor attempted to shoot him with it. (TV: Last of the Time Lords)"@en . "Incorporating various technologies, including a miniaturised system based on the age-regression technology developed by Professor Richard Lazarus, the laser screwdriver was powered by an Artron crystal taken from the Doctor's TARDIS. (Doctor Who DVD Files) The laser screwdriver had isomorphic controls so only the Master could operate it. This was revealed when the Doctor attempted to shoot him with it. (TV: Last of the Time Lords) As a fatal weapon, the laser screwdriver shoots highly lethal laser energy, in which the force produced was enough to send a human flying several feet. (TV: The Sound of Drums / Last of the Time Lords) However, it's effectiveness dwindled when used against The Doctor, who was protected by a psychic field generated by the Archangel network. Apart from the killing function, the laser screwdriver is capable of artificially ageing a target. The Master used the function to age The Doctor using a sample of his genetic code taken from his severed hand, turning him into an aged creature. (TV: The Sound of Drums / Last of the Time Lords)"@en . .