This instrument is designed to monitor sound quality in various environment. It can be widely used in noise control engineering, quality control, health and treatment, home environment monitoring, etc. Features: Mini digital sound level meter with stable and reliable performance. Wide measurement range from 30dB to 130dB. Fast and slow sampling rate for choice: 125ms or 1s. Data hold function, maximum and minimum value measurement. 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. LCD display with backlight, convenient to use at night. Equipped with sponge ball. Specifications: Display: 4 digits LCD, Max Display 9999 Measuring Range: 30~130dB Sampling Rate: 125ms(fast mode) / 1s(slow mode) Operating Temperature: 30~40 degrees C( less than =80percent RH) Storage Temperature: -20~60 degrees C( less than =80percent RH) Altitude: Max.2000m Power Supply: 3 * 1.5V AAA Batteries(not included) Item Size: 14.5 * 5 * 2.5cm / 5.71 * 1.97 * 0.98in Item Weight: 78g / 2.76oz Package Size: 23.5 * 11.5 * 3.5cm / 9.25 * 4.53 * 1.38in Package Weight: 136g / 4.8oz Package List: 1 * Sound Level Meter