Digital Sound Level Meter Decibel Logger 30-130dB Features: It is designed according to 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 holding function to lock up the maximum reading. Large LCD screen with digits reading. Equipped with a sponge ball. Auto power off design for energy saving. Auto backlight display. Portable, easy-to-use and handy instrument for sound quality control in factory, traffic, family, and audio system. Specifications: Measuring range: 30-130dBA Accuracy: 1.5dB Frequency range: 31.5Hz to 8.5KHz Frequency weighting: A Digital display: 4digits Resolution: 0.1dB Sample rate: 2 times/second Microphone: 1/2 inch electret condenser microphone Max hold: MAX Power supply: 9V battery (the battery is not included) Power life: About 30 hours (alkaline battery) Operating condition: 0-40 10-80%RH Storage condition: -10--+60 10-70%RH 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