Hand-held electronic 'eraser' device

According to Senior librarian Ms Millicent Davies, the Ninth Doctor used a "hand-held electronic 'eraser' device" to remove entire paragraphs from various biographies kept in the York Central Library and replace them with his own scribbles. (PROSE: Have You Seen This Man?)
== Behind the scenes ==
It is not clear if this device was meant to be a description of the Doctor's sonic screwdriver from someone unfamiliar with said device or a unique device. 
Category:The Doctor's devices