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cette application has been tested with external microphone MicW i436, which is a calibrated measurement microphone complying with the Class 2 (IEC 61672) sound level meter standard.  The application was created by the team that has over 10 years experience in calibration, owning a Sound Level Meter calibration laboratory meeting the ISO 17025 requirements.  cette application is an intuitive professional-grade sound level meter for iPhone and iPod touch.  The initial calibration works incredibly well and is determined with testing in an anechoic chamber meant for calibration of professional Sound Level Meters.  We do not recommend changing the initial calibration since we have established that the internal sensitivity of the microphones has insignificant variation between different iPhone models.  It features all the tools that are expected from a professional ANSI or IEC compliant Sound Level meter.  If you use an acoustic calibrator with a 1/4-inch adapter, cette application can perform automatic calibration.  Spectrum view offers a view of time-history of the sound Level which is frequency and time-weighted.  The readings you get are as accurate as it gets, because we tested the app with different iPhone models and take into account the differences in microphones between different generations of iPhones.  cette application is specifically tailored to meet needs of Occupational health measurements.  All filters, averaging modes and statistics meet or exceed class 2 requirements of relevant ANSI and IEC standards .  Occupational Health compliant parameters including: Noise DOSE, Elapsed time.  Our tests have shown that the internal microphone has better performance than the microphone on the factory provided in-ear headphones.  After you install the app you can start measuring immediately using the internal microphone.  Special parameters: LEX 8h, Projected DOSE, Time to reach 100% DOSE (in hh:mm:ss).  The app makes full use of the iPhone's dynamic range which is approximately 45 dB to 100 dB (re.  Measuring sound is what we do.  Now, on the iPhone and iPod touch.  The same calibration equipment was used for the development of this app.  20 uPa) and frequency response range which is from 100 Hz to 8 kHz.  The app has been developed to run on devices running iOS 10 or higher.  ***Sleek app design that is specially appropriate for any light conditions.