Measure UV-AB Light from Natural and Artificial Light Sources The Extech UV505 pocket-sized UV light meter measures UV-AB light from natural and artificial light sources used in outdoor activities and indoor medical testing, laboratory/research, industrial, education, electronics, and forensics/criminology applications. It offers a backlit display, cosine corrected sensor, two selectable ranges, zero function, display hold, and auto power off. Includes a pouch to protect and store your meter.