Thermal insulation casing

The thermal insultation was a part of the Eleventh Doctor's sonic screwdriver. Sandwiched between the sections of the screwdriver that could extend, it was located above the easy-grip handle which had cooling cells inside. (PROSE: ) In a guide about Time Lords, both annotated and improved by the Eleventh Doctor, he wrote in a section about gadgets that if the screwdriver was to be held it should be held by the handle, else risk burning the user's fingers. (PROSE: )

History

 * See Eleventh Doctor's sonic screwdriver for general information about the screwdriver.

At some point during the Eleventh Doctor's travels with Clara Oswald, he began annotating and improving a guide about Time Lords. He added a section about the gadgets inside the TARDIS, advising any readers to hold the screwdriver by the handle. (PROSE: )

Behind the scenes
to be added