A grade laser level scans for measurement of elevation at Nigerien Air Base 201, Niger, May 9, 2017. Laser levels are used by engineers to ensure elevation is consistent at a work site before beginning further construction. ( Air Force photo by Senior Airman Jimmie D. Pike)

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Size: 3000px × 2400px
Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
Model Released: No

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