An easy to use instrument for the calibration of sound level meters, Conforms to ANSI S1.40 - 1984 and IEC942 1988 Class 2. Calibration levels of 94dB and 114dB. Fits 1in., 1/2in. and 1/4in. microphones, Wyjście dźwięku = 114 dB, 94 dB, Częstotliwość = 1k