simpson890-2 Calibrators

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 level meters with a 1" diameter microphone.  The 890-2 provides a constant 94 dB or 114 dB sound pressure level at 1 KHz.  Calibrator is immune to a wide range of temperature and humidity conditions while maintaining tight output level tolerances.