Wildly application :Great tool for monitoring noise levels in hotels, conference halls, home theater, hospitals, and any other noise sensitive environments. easy and convenient to useThis digital noise meter Mini handheld noise meter with light weight, easy and convenient to use. sound quality control design This noise testing equipment is designed for sound quality control that measures sound level from 30dBA ~ 130dBA. Equipped with sponge ballEquipped with sponge ball to filter out unwanted signals. LCD displayIt can convert sound into electrical signals, process data and displays results on LCD. Measurement range: 30 ~ 130dba. Accuracy: 1.5db. Big number & resolution: 4 digits & 0.1db. Frequency response: 31.5Hz ~ 8KHz. Measurement gear: 30 ~ 80db, 50 ~ 100db, 60 ~ 110db, 80 ~ 130db, 30 ~ 130db. Work temperature and humidity: 0 ~ 40 ; 10 ~ 85%Rh. Storage temperature and humidity: -10 ~ 60 C, 10 ~ 70%RH. Time feature: Fast: Fast; Slow: Slow. Sampling frequency: 2 times/second. Microphone: 1/2 inch capacitor microphone. Overload display: "Over"/"UNDER" symbol representation. Frequency weighted features: A and C weighted. MAX lock. AC and DC model output. Low electric prompts. Automatic shut-down. Power: 4*1.5V battery or DC 6V 100MA power supply.