Features:  This is an easy to use and handy Mini Sound Level Meter.  Designed for sound quality control that measures sound level from 30dBA up ~ 130dBA.  It has auto range, wide measuring and frequency range (31.5Hz ~ 8KHz), maximum hold, Frequency Weighting A and Auto Backlight.  Just press one button readings are instantly displayed. A practical little tool great for noise pollution monitoring, home theater setup, health and safety compliance, vehicle noise testing, etc.  Auto backlight has a light sensor on top of LCD that detects environment lighting condition. Lighting display intensifies as the environment lighting condition gets darker.  The darker the environment the brighter the illumination.Also, it it reads in dBA and provides windscreen to filter-out unwanted signals.  Auto Power Off, Low Battery Indication, Max Hold Function      Specification:  Material: Plastic  Color: As shown  Model: GM1359  Measuring Range: 30 ~ 130dBA  Accuracy: ±1.5dB  Resolution: 0.1dB  Frequency Range: 31.5HZ ~ 8KHZ  Frequency Weighting: A  Sampling Frequency: 2 times/sec  Microphone: 1/2" Electret Condenser microphone  Operating Condition  Temperature: 0~40°C  Humidity: 10~80%RH  Storage Condition  Temperature: -10~60°C  Humidity: 0~90%RH  Power Supply: 3 x 1.5V Battery (not included)  Size: 5*3.1*15.5cm/2*1.2*6.1in    Note:  1. The product can be reused  2. Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting.