Sound Level Meter with USB Interface Flagship of the Tenma sound level meter line provides features normally exclusive to sound level meters costing much more. It is perfect for sound system testing, speaker system measurement and environmental noise level monitoring. USB interface with datalogging software Internal datalogging of up to 20,000 records A and C weighting Selectable fast / slow response time Analog bargraph display Large 1999 count backlit LCD display analog bargraph and numerous on-screen icons USB interface with included cable and datalogging software Included AC adaptor or battery operation Selectable MIN or MAX hold and data hold function Three measurement ranges Threaded insert which accepts standard tripod mount 0.1dB resolution Selectable auto-power-off Rugged blow molded carry case Removable windscreen Includes manual and 9V battery Measurement ranges: Low: 30 ~ 80dB Medium: 50 ~ 100dB High: 80 ~ 130dB Auto: 30 ~ 130dB Specifications:Frequency range: 31.5Hz ~ 8KHz Microphone element: 1/4" electret condenser Sample rate: 0.5 seconds Time weighting: 125mS (fast), 1 Sec. (slow) Accuracy: ±1.4dB @ 1KHz, 94dB DC output: 10mV/dB, 1KΩ load AC output: 1VRMS per each range step, 100Ω load Dimensions: 9¾" (L) x 2½" (W) x 1" (D)