Digital Sound Level Meter Decibel Recorder 30-130dB Features: It is designed according to the following standards, International Electrician Committee Standard: IEC 651 TYPE 2 & ANSI 1.4 TYPE 2. With modern compact and portable appearance design. Accuracy up to 1.5dB. Maximum value hold function to lock maximum reading. Large LCD display with digit reading. Equipped with sponge ball. Auto power off design to save power. Display automatic backlight. Portable instrument, easy to use and practical for monitoring sound quality in factories, traffic, family and audio system. Features: Measuring range: 30-130dBA Accuracy?: 1.5?dB Frequency range: 31.5?Hz to 8.5?KHz Frequency weighting: A Digital display: 4 digits Resolution?: 0.1?dB Sampling rate: 2 times/second Microphone: 1/2 inch electret condenser microphone Maximum hold: MAX Power supply: 9V battery (battery is not included) Battery life: About 30 hours (alkaline battery) Operating condition?: 0-40? 10-80?% HR Storage condition?: -10--+60? 10-70?% HR Product weight: 105g Package weight: 130g Product size: 14.2 * 5.3 * 3.5cm Package size: 15.2 * 6.0 * 4.2cm Package List: 1 * Sound Level Meter 1 * Sponge Ball 1 * User Manual