Sound level meter with LEQ Centertek 392

CENTER-392 Integrating Sound Level Meter (IEC 61672-1 class 2)   In contrast to cheaper sound level meters, this device can measure the LEQ according to IEC61672. Most sound level meters can measure the sound level with time weighting F (fast) or S (slow). However, in practical measurements, integrating sound levels are most important. Integrating means energy equivalent averaging. This calculation differs from a simple arithmetic average. Features Complies with IEC 61672-1 class 2 standard Measures Leq, MaxL, MinL, SPL 64,000 Records Data Logger PC interface With Windows Software AC / DC Signal Output Back-lit display Usb connector SPECIFICATIONS Level Range: 30~130dB Accuracy: ±1.4dB (ref. 94dB@1KHz) Frequency Weighting: A / C Time Weighting: Fast, Slow Frequency Range: 20Hz to 8KHz Microphone: 1/4 inch Electret condenser microphone (outer diameter is 1/2") Measuring Time: 10s, 1m, 5m,10m,15m,30m,1h,8hrs,24hrs Auxiliary Outputs: AC/DC Output Battery: 1.5V AA size battery x 4(Batteries are not included) Dimensions: 272x83x42 mm Weight: Approx.390g   Typical selfnoise is 29dB/A. (measured by us)