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Bruel & kjaer 4230 sound level meter calibrator
Bruel & Kjaer 4230 Sound Level Meter Calibrator
Bruel and Kjaer Calibrator model 4230.
It suits 1/2 inch and 1 inch Microphone Capsules such as Bruel and Kjaer etc.
It is working and has been recently been used for approvals testing of telephones.
It produces 94 dB at 1 KHz and uses a 9 volt PP3 battery to operate it.
