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https://publications-cnrc.canada.ca/eng/view/object/?id=d2a9b169-7e85-47c8-8de9-44c3233123db Methods of reducing measurement uncertainties when using digital recorders - NRC Publications... Methods of reducing measurement uncertainties when using digital recorders digital recorders methods reducing measurement uncertainties https://explore.omsystem.com/us/en/digital-recorders OM SYSTEM Digital Recorders | Capture & Record Sound om system digital recorders capture sound