Check the listing for details. Portable Sound Level Meter Sound Decibel Meter with Frequency Range 20Hz~8kHz. Condition: New. Listed at 110.00 USD. Portable Sound Level Meter Sound Decibel Meter with Frequency Range 20Hz~8kHz Note: Battery not Included During The Shipping !!! Introduction:Widely used to test the sound level of environment, machinery, vehicle, ship and other noise. For industrial environmental protection, construction, health care, teaching and research department. Features:Permits choice “A”, “C” , “F” weighting and “Fast” / “Slow” response times.Offers 4 measurement parameters: Lp (sound level); Leq (Equivalent Continuous A Sound Level ); Lmax ( Maximum Sound Level) and LN (Percent of all readings over alarm value set ).DC output :1 0 m V / d B.Can memorize 30 groups of measurement results and measuring conditions.Auto range selection and digital display with no guessing errors.Use USB/RS-232 data output to connect with PC. (optional)Provide Bluetooth data output choice. (optional) Specification:StandardsIEC 651.2, ANSI 1.4.2ParamentsMeasuredLp-Sound LevelLeq-Equivalent Continuous A Sound LevelLmax-Maximum Sound LevelLN-Percent of All Reading Over Alarm Value SetTestingRangeLp30~130dB(A Weighting)35~130dB(C Weighting)40~130dB(F Weighting)Leq30~130dB(10Seconds,1Min,5Min,10Min,15Min,30Min,1Hour,8Hours,24Hours)LN0~100%Resolution0.1dBAccuracy1dBFrequency Weighting‘A’/’C’/’F’*(Flat)Time WeightingFast (125 ms)/Slow (1 Second)Microphone1/2 Inch Electret Condenser TypeMemory30 Group with Measuring ConditionsCalibration Signal Built in94dB at 1k Hz(sinusoidal)Frequency Range20~12,500 HzAlarm Value Set30~130 dBAlarm OutputLED Optional Relay Contact(NC)IndicatorLow Battery IndicatorPower Supply4x1.5V AAA Size (UM-4)Battery (not included)External DC Power Supply6V,DC,100mADimensions236x63x26 mmWeight170 g Accessories: Standard AccessoriesMain UnitWindscreenCarrying Case (B04)Operation ManualOptional AccessoriesND9 Sound Level Meter CalibratorRS-232C Data with SoftwareBluetooth Data Adapter with Software