The Mini Sound Meter is designed to monitor sound quality in various environments. It can convert ambient sound into electrical signals process data and displays results on LCD. It does not have traditional meter issues such as the meter being too large or complex and can constantly monitor ambient sound. It is light weight compact ergonomic and user friendly making it a great tool for monitoring noise levels in schools and any other noise sensitive environments. It provides a stable and reliable performance.Features:Wide measurement range from 30dB to 130dB. When measuring under MAX mode the meter will only display the value greater than the current value; when measuring under MIN mode it will only display the value less than the current value. Fast and slow sampling rate for choice: 125ms or 1s. Data hold function maximum and minimum value measurement. LCD display with backlight convenient to use at night. Equipped with sponge ball.Specifications:Display: 4 digits LCD Max Display 9999Measuring Range: 30~130dBSampling Rate: 125ms(fast mode) / 1s(slow mode)Operating Temperature: 30~40°C(<=80%RH)Storage Temperature: -20~60°C(<=80%RH)Altitude: Max.2000mPower Supply: 3 x 1.5V AAA Batteries(not included)Item Size: 14.5 x 5 x 2.5cm Item Weight: 78g