1、This equipment is designed to meet the measurement requirements of safety engineers, health, industrial safety offices, and sound quality control in various environments including factories, offices, traffic, families, and audio systems. 2、With portable, anti-drop, anti-skid, and anti-static, suitable for one-handed operation with a comfortable feeling. 3、With a large LCD screen with backlight, cool and modernized, easy to operate and easy to read even in the dark. 4、It will automatically shut down after not operating for several minutes to ensure battery life and support low battery indication. 5、Designed for sound quality control, measuring sound level from 30dBA-130dBA with an accuracy of ±5dB. 6、The LCD screen has a light sensor that detects the ambient lighting conditions; as the ambient light gets darker, the light brightens.