General Radio 1567 Sound Level Calibrator & 1983 Sound Level Measuring Set

Sound Level Meter Calibrator, Precise Decibel Meter Calibrator with 3 Calibra...

General Radio Permissible Sound Level Calibrator

General Radio Company Type 1567 Sound Level Calibrator (114dB, 1kHz)

General Radio Co. 1562-A Permissible Sound Level Calibrator (114dB, 125-2000Hz)

Simpson 886-2 Type 2 Multi Weight Sound Level Meter 40-140db, 890-2 Calibrator

General Radio Sound-Level Calibrator Type 1562-A w/ Case (Parts, UNTESTED)

General Radio Co. 1562-A Permissible Sound Level Calibrator (114dB, 125-2000Hz)