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 Ranging         Fast/Slow time weighting selection         32000 Reading Internal Memory    (Data record function)         Data Logging function         Max Hold function         Frequency weighting: A/C         High Accuracy         Bar graph display         AC/DC function         PC Interface    (Compatible with Windows 10, 8, 7,  Vista and XP)         When connected to computer, the measurement are live on computer screen too         White Backlight         Adjustable Over / Under alert threshold via computer interface         Maximum data recording limit can be adjusted via the PC interface         Time display         Auto-off function setup         Low Battery Alert         Tripod Mount (Tripod not included)         Includes CD Software (language: English), AC/DC wire & batteries)         CE    Certified &    RoHS    Compliant           Standard Applied: IEC651 type 2, ANSI SI .4 type 2  Calibration sound source: 94dB @ 1kHz  Measurement range: 30~130dBA  Accuracy: +1.5dB(reference sound pressure standard,94dB@1KHz)  Record Interval: 1~60 sec / 1~60 min / 1~24 hrs  Frequency response: 31.5~8.5KHz  Resolution: 0.1dB  Frequency weighting: A/C  Analogy bar graph: 2dB/1 Bar graph  Measurement Unit: dBA / dBC  Sampling rate: 2 times/second (FAST), 1 time/second (SLOW)  AC signal output: 4Vrms/ full barograph, output impedance is approx 600 ohm  DC signal output: 33mV/dB  Dynamic characteristic: FAST (high speed) / SLOW (low speed)  Data storage quantity: 32000 readings  Windows 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 cable  Item Weight: 7.4 ounces  Product Dimension: 9 x 2.5 x 1.5 inches  Shipping Weight: 14.6 ounces  Shipping Dimension: 9.