Senior Airman Troy Marquez, 49th Maintenance Squadron Precision Measurement Equipment Laboratory technician, creates a 45 degree angle to use as a reference to check levels at Holloman Air Force Base, N.M. May 28, 2015. Levels are marked with hash marks, which indicate a deviation from a horizontal reference point. Levels are often used in construction and are essential in ensuring building equipment are created at proper angles to ensure safe, sturdy building. (U.S. Air Force photo by Airman 1st Class Emily A. Kenney/Released)
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