Precision Measurement & Wide Range】▶With a high accuracy(+/-1.5dB,0.1 dB resolution) and a wide measurement range(30dBA-130dBA),the noise level meter is a useful device for you to measure the noise of running machines,music ,neighbor or speech therapy and so on.More Intelligent Functions】▶Automatic power off function plays an important part in eliminating waste of electricity.Furthermore,low power indication is designed to remind you to replace battery in time.Auto Power Off & Overload Indication】▶Max hold function is able to freeze the max recording and over-range measurement warning sign is designed for guiding you to select the correct range (30-80dB;50-100dB;60-110dB;80-130dB)according to real reading.And self-check function will keep 10 seconds for each opening opportunity.Convenient for Further Analysis】▶There are output interfaces (AC/DC output) on the side of noise measurement device,which can be better connected with other devices,such as X-Y axis recorder or frequency analyzer for statistical analysis.Meet Different Test Conditions】▶Frequency weighting C is suitable for measuring mechanical noise and A for the noise felt by human ear.Furthermore,there are two time weightings ,including “Fast”for real-time measurement and “Slow” for average noise volume.Resolution: 0.1dBLinearity Range: 50 dBFrequency Weighting: A/CTime Weighting: Fast / SlowFrequency Range: 31.5 Hz~ 8.5K HzMeasurement Range: 30~130 DecibelAccuracy: ±1.5 dB (Under Reference Conditions)Operating Temperature: 0℃ to 40℃Operating Humidity: 10% to 80% RHMicrophone: 1/2 Inch Electric Condenser MicrophoneLevel Ranges： 30-80dB;50-100dB;60-110dB;80-130dBFesture✔ Max Data Hold✔ Auto Power Off✔ Self Calibration✔ AC/DC Signal Output✔ Low Power Indication Package1 * Sound Level Meter1 * Case Bag1 * Instruction Manual1 * Windscreen1 * Output Wire