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In addition, sound levels are also measured using the A-weighted scale and are recorded on a separate dosimeter from the measurements made using the SPL scale. This allows for a comparison between the A-weighted scale results and the SPL scale results. The manufacturer's ratings regarding the performance of the dosimeters are as follows:
Spectrum: Provides a wide dynamic range of sensitivity (20 to 100,000 dBA), but a limited useful range of frequencies (100 Hz to 10 kHz).