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Does this online meter transfer data to the server?
No, all audio data is being used locally.
What standard does this meter use?
It uses the ITU-R BS.1770-4 standard.
How accurate is this meter compared to other professional SPL meters?
Analyzing from the file will give you accurate results comparable to results from other professional analyzers. Currently, only the stereo mode is supported. Other channel configurations will be introduced soon.