CEM DT-8820 certified industrial digital multi-function environment meter. This 4-in-1 meter replaces 4 traditional meters to make your work a lot simpler and efficient. Forget about the old analog devices. This newly designed digital light weight device gives you long lasting power with accurate measurement. The build-in Sound level, Light, Humidity, and Temperature measuring functions replace meters with over $500 combined cost. A FREE heavy duty carrying bag is also included for bringing your device to the fields conveniently.