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- simpson890-2 Calibraor, Sound pressure level calibrators are used before or after taking measurements with sound level meters and noise dosimeters. The 890-2 can adjust Simpson models 886-2 and noise dosimeters. The 890-2 can adjust Simpson models 886-2 and 884-2 or other sound level meters with a 1" diameter Microphone. The 890-2 provides a constant 94 dB or 114dBsound pressure level at 1KHz(0 dB=0.0002 Mbar).Calibrator is immune to a wide range of temperature and humidity conditions while maintaining tight output level tolerances. simpson890-2 Calibrator,Sound pressure level calibrators are used before or after taking measurements with sound level meters and noise dosimeters. The 890-2 can adjust Simpson models 886-2 and 884-2 or other sound sevel meters with a 1" diameter Microphone. The 890-2 provides a constant 94 dB or 114dB sound pressure level at 1KHz(0 dB=0.0002Mbar).Calibrator is immune to a wide range of temperature and humidity conditions while maintaining tight output level tolerances.
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