GA607 Dual level calibrator (IEC942 Class 1)
The GA607 is recommended for use with Castle Group's Class 1 meters and produces 94dB at 1kHz or 104dB at 1kHz. It has a half inch (27.25mm) cavity. Complete with GA690 Barometer.
GA601 Single level calibrator (IEC942 Class 2)
The GA601 is recommended for use with with Castle Group's Class 2 meters and produces a single level of 94dB at 1kHz. It has a half inch (27.25mm) cavity.