This Decibel Meter with PC Interface is compact and easy to use while providing you an accurate readings in a greater range than similar inexpensive sound meters on the market.This sound meter can read between 30dB~130dB , and capture data to a PC using the compatible software (included in the set).Applications includes : Environmental measurement, law enforcement, work place design, sound level analysis of machinery and engines.Auto RangingFast/Slow time weighting selection32000 Reading Internal Memory (Data record function)Data Logging functionMax Hold functionFrequency weighting: A/CHigh AccuracyBar graph displayAC/DC functionPC Interface (Compatible with Windows 10, 8, 7, Vista and XP)When connected to computer, the measurement are live on computer screen tooWhite BacklightAdjustable Over / Under alert threshold via computer interfaceMaximum data recording limit can be adjusted via the PC interfaceTime displayAuto-off function setupLow Battery AlertTripod Mount (Tripod not included)Includes CD Software (language: English), AC/DC wire & batteries)CE Certified & RoHS CompliantStandard Applied: IEC651 type 2, ANSI SI .4 type 2Calibration sound source: 94dB @ 1kHzMeasurement range: 30~130dBAAccuracy: +1.5dB(reference sound pressure standard,94dB@1KHz)Record Interval: 1~60 sec / 1~60 min / 1~24 hrsFrequency response: 31.5~8.5KHzResolution: 0.1dBFrequency weighting: A/CAnalogy bar graph: 2dB/1 Bar graphMeasurement Unit: dBA / dBCSampling rate: 2 times/second (FAST), 1 time/second (SLOW)AC signal output: 4Vrms/ full barograph, output impedance is approx 600 ohmDC signal output: 33mV/dBDynamic characteristic: FAST (high speed) / SLOW (low speed)Data storage quantity: 32000 readingsWindows Compatibilty: Windows 10, 8, 7, Vista and XP (Do not run in Mac OS)Power supply: 4pcs x AA Size 1.5V battery or USB power cableItem Weight: 7.4 ouncesProduct Dimension: 9 x 2.5 x 1.5 inchesShipping Weight: 14.6 ouncesShipping Dimension: 9.