Depth Gage and Combination Square - 4: Square Head
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The square head has multiple uses when used with the blade. It can be used as a rough depth gage as shown in this video.

It can also be used to scribe 90 and 45 degree angles on your layout.

Additionally, since the square head also has its own spirit bubble it can be used for setups where parallelism and/or perpendicularity are issues.

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label: measurment, depth gage, combination square, protractor head, square, head, center head