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The combination square was invented by Laroy S. Starrett in 1877

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The primary components are a ruler, level, and a 90º & 40º square.

The accessories are a scribe for marking your measurement, and a locking screw to hold it in place.

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The primary uses are for measuring and marking 90° & 45° angles, finding depth, finding the center of round objects, and acting as a ruler.

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All About Combination Squares | Ask This Old House

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In carpentry we will use the combination square to measure and cut straight lines as well as use it to find the depth of different objects.

It is helpful to become proficient with a combination square in order to cut straight and accurate lines.