4 These weathering test sites utilize the latest technology in weather reporting instrumentation, such as total solar (Ultraviolet, Visible and Infrared), total UV and narrow- band UV radiometers, and pyrheliometers. The Atlas laboratory test instruments are directly traceable to national and international standards, including the World Radiometric Reference (WRR) and the National Institute of Standards and Technology (NIST). Broadband UVS

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