Editing Combination square (section)

{{Short description|Measuring and marking tool}}
{{Use dmy dates|date=October 2023}}{{Infobox tool|name=Combination square|caption=A Starrett combination square with a standard head|classification={{unbulleted list|Hand tool|[[Square (tool)|Type of square]]}}|image=Combination square.jpg|other_name={{unbulleted list|Combo square|Adjustable square|Sliding square}}|inventor=[[Laroy S. Starrett]] (1877)}}A '''combination square''' is a multi-purpose measuring and marking tool used in [[metalworking]], [[woodworking]], and [[stonemasonry]]. It is composed of a [[Ruler|rule]] and one or more interchangeable heads that can be attached to the rule.<ref name=":4">{{Cite book |last=Dotson |first=Connie |url=https://books.google.com/books?id=qCpBBAAAQBAJ |title=Fundamentals of Dimensional Metrology |publisher=[[Cengage Learning]] |year=2015 |isbn=978-1305177741 |pages=100–106}}</ref><ref name=":3">{{Cite book |last=Raghavendra, N. V. |url= |title=Engineering metrology and measurements |publisher=[[Oxford University Press]] |others=Krishnamurthy, L. |year=2013 |isbn=978-1-68015-280-7 |location=New Delhi |pages=89–91 |oclc=900729269}}</ref> Other names for the tool include '''adjustable square''', '''combo square''', and '''sliding square.'''

The most common head is the standard head, which is used as a [[Square (tool)|square]] for marking and testing 90° and 45° angles.<ref>{{cite book |last=Campbell |first=Paul D. Q. |title=An Introduction to Measuration and Calibration |publisher=[[Industrial Press, Inc|Industrial Press Inc]] |year=1995 |isbn=978-0-8311-3060-2}}</ref> The other common types of head are the protractor head, and the centre finder head.<ref name=":1">{{Cite book|last1=Livesey|first1=Andrew|url=https://books.google.com/books?id=54grhsUcM3gC&q=%22combination+square%22&pg=PT122|title=The Repair of Vehicle Bodies|last2=Robinson|first2=A.|date=2013-02-11|publisher=[[Routledge]]|isbn=978-1-135-12049-8|edition=6th|pages=93|language=en}}</ref>