‎As Labeled

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The simple and safe way to test for radon
Listed under the EPA radon gas measurement proficiency program

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Multiple Gradations: Gradations Included For Marking Common, Hip, Valley, And Jack Rafters; Useful For Determining And Marking Angles And Making Square Cuts On Boards
Features: Pocket-Sized Swanson Blue Book, A Comprehensive Guide To Help Workers Make Correct Angle Cuts For Any Pitched Roof