Hairdryer

A hairdryer was a device used to dry hair, normally after it was washed.

As the Ninth Doctor searched through a stockpile of weapons in Adam Mitchell's workshop in GeoComTex to destroy the last of the Daleks, one of several weapons he chucked away was dismissed as a "hairdryer." (DW: Dalek)

Hairdryers could interfere with the sonic screwdriver. (DW: Forest of the Dead)