1This is an easy to use and handy Mini Sound Level Meter. 2Designed for sound quality control that measures sound level from 30dBA up ~ 130dBA. 3It has auto range, wide measuring and frequency range (31.5Hz ~ 8KHz), maximum hold, Frequency Weighting A and Auto Backlight. 4Just 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. 5Auto backlight has a light sensor on top of LCD that detects environment lighting condition. Lighting display intensifies as the environment lighting condition gets darker.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, Maximum Hold FunctionSpecification:Model:RZ1359Measuring 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 microphoneOperating Condition Temperature: 0~40C Humidity: 10~80%RH Storage Condition Temperature: -10~60C Humidity: 0~90%RH Power Supply: 3 x 1.5V Battery (not included) Size: 5*3.1*15.5cm/2*1.2*6.1inWeight: Approx.205g/7.2oz Package list: 1 * Noise Tester (Battery not included)