Description: AC and DC output for frequency analyzer level , FFT analyzer, graphic, graphic etc. Without The meter can be connected PC with USB Large LCD screen with digits reading Portable, easy-to-use and handy instrument Conformed to the IEC651 and ANSIS1.4 Type 2 Standards Accuracy: ±1.5dB Measuring range: 30-130dBA or 35-130dBC Frequency weighting: A and C Time weighting: Fast & slow Operation Environmental condition: Below 2000 meter in height Operating condition: 0℃~40℃, 10~80%RH Use dry cloth to clean the unit, but never with any solvent. Specification: Frequency range:31.5Hz~8.5KHz Level range: 30~80dB, 40~90dB, 50~100dB, 60~110dB, 70~120dB, 80~130dB, 30~130dB Linearity weighting: 50dB Frequency weighting: A/C Digital display: 4 digits Resolution: 0.1dB Sample rate: 2times/second Bar graph: 50dB scale 1dB step for current sound pressure level display Sample rate: 20 times/second Over indication: AC output: 0.707Vrms at FS impedance approx 600ohm DC output: 10mV/dB, output impedance approx 100ohm Time weight: FAST/SLOW Microphone: ½ inch electret condenser microphone : MAX Power supply: 1.5V AA alkaline battery (the battery is not included) or USB 5V 100mA : About 30 hours(alkaline battery) Self calibration: 4S Operating condition: 0℃~40℃, 10~80%RH Size: Approx. 24 x 7 x 3.5cm/9.45 x 2.76 x 1.38inch Package Includes: 1x Professional Sound Level Meter 1x USB Cable 1x English Instruction Manual Note: 1.Do not operation the meter at high Humidity environment. 2.Please take out battery from the meter if not in use for long time. 3.Once using the meter in the presence of wind, it is a must to mount the sponge ball to not pick up undesired signals.