drafting instrument drafting instrument /ˈdræftɪŋ ˈɪnstrʊmənt/

noun

1. An instrument used by a draftsman in making drawings  ( drafting instrument )
   an instrument used by a draftsman in making drawings
    Architects and draftsmen rely on various drafting instruments to create precise plans.
   Architects and draftsmen rely on various drafting instruments to create precise plans.