Handy Mini Digital Noise Meter Sound Level Meter Noise Measuring Instrument GM1357 Features: 1. It can convert sound into electrical signals, process data and displays results on LCD. 2. Mini handheld noise meter with light weight, easy and convenient to use. 3. Designed for sound quality control that measures sound level from 30dBA ~ 130dBA. 4. Equipped with sponge ball to filter out unwanted signals. 5. Great tool for monitoring noise levels in hotels, conference halls, home theater, hospitals, and any other noise sensitive environments.   Specifications: Color; White Measuring Range: 30~130dB, 35~130dBC Frequency Weighting Characteristic: A & C Accuracy: ±1.5 dB Digit & Resolution: 5 bits & 0.1dB Frequency Response: 31.5Hz ~8.5KHz Time Weighting: FAST / SLOW Sampling Rate: 2times/second Microphone: 1/2inch Capacitance Microphone Power Supply: DC 6V 100mA Adapter or 4pcs 1.5V AA Batteries (NOT included) Dimension: 256*70*35mm / 10.08*2.76*1.38in Weight: Approx. 816g   Package List: 1x Digital Noise Meter (Batteries is NOT included) 1x Output Line 1x Windproof Ball 1x Manual 1x Box