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