I was using a Behinrger ECM8000 - cant tell you if it is good or not however - all I can say is either it or the device it was plugged into seemed to have differing opinions on what the actual mic sensitivity was so it was about 10dB down on the measurements for SPL compared to a proper SPL meter.
Ive used it for room accoustic balancing as well - same issue - one or the other got it wrong IMHO - cant tell which of course...
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