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=== Protractor head === [[File:Combination_square_protractor_head_diagram.png|thumb|280x280px|Labelled diagram of the protractor head]] The [[protractor]] head can be used for: * Measuring and checking angles between surfaces, edges, and markings. * Marking angles from an edge * Directly transferring angles, like a [[Sliding T bevel|bevel gauge]] (sliding T gauge), to minimise measurement errors and inaccuracies. * Measuring and marking angles relative to the horizontal by using the spirit level.<ref name=":3" />
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