General Radio 1562A Sound Level Calibrator
The 1562A Sound-Level Calibrator is small in size but big in performance.... a self-contained unit for making accurate field calibrations on microphones and sound-measuring instruments. This calibrator fits in the palm of your hand, operates on its own battery power, features a single fumble-free control, and provides a precisely known sound-pressure level at five ANSI-preferred frequencies.
* Frequencies: 125, 250, 500, 1000, and 2000Hz
* Sound-Pressure Level: 114 dB re 20 ?N/m2
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