Selections of light meter models for industrial and building audit usage. Providing essential footcandle and Lux readings, Extech’s digital light meter range includes affordable, general-use models as well as sophisticated datalogging, LED (white, red and blue), and UV light meter choices.can help you measure and maintain adequate light levels in schools, hospitals, laboratories, industrial workspaces, passageways and more. Help ensure a healthier and safer environment by using the right light meter for your application. Shop a broad selection of precision light meters at Grainger to help find what you need.