Portable Sound Level Meter: A handy little tool ideal for noise monitoring, home theater setup, health and safety compliance, vehicle noise testing, and more LCD display HD digital: large readable LCD screen with backlight, which can quickly display the measurement, clearly and easily readable. Power source: low battery indicator, automatic shutdown without operation after 10 minutes, convenient and saving energy. Multifunction: measurement range from 30 to 130 dBA. Maximum/Minimum/Data Hold Function - Auto Power Off - Battery Indicator: Directly check the remaining battery. Wide Uses: Designed to meet the measurement requirements of sound quality monitoring in various environments. Ideal for testing music recording, neighbor noise complaints, industrial settings, office settings, voice therapy and more.