Nonelectrical properties testing devices capture information and identify potential issues in equipment with no electrical components. They are used for materials testing, equipment inspection, and product research. Borescopes are used to visually inspect hard-to-reach areas that are not usually visible without taking them apart, such as parts of vehicles and aircraft. Light meters measure lighting conditions to help maintain adequate light levels in schools, hospitals, laboratories, and industrial workspaces. Moisture meters measure moisture in wood, drywall, soil, and other building and farming applications to help ensure the quality and integrity of the materials. Environmental meters measure multiple properties such as sound, air velocity and volume, temperature, humidity, and light to provide complete information about environmental conditions.