Meets or exceeds ANSI S3.6 1989, (ASA 81-1989) ISO 389-1985, C.H.D.P, O.S.H.A, E.P.S.D.T. ,F.A.A., Police, Divers, requirements Hearing Threshold Range: 0 to 90dB in 5dB steps Accuracy better than ± 2 dB Harmonic Distortion - less than 3% Tone...
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