With 3 Hz to 25 kHz frequency range, ½ in. Model 377A21 provides accurate response in diffuse field applications where frequencies above human audible range need to be measured precisely. Device avoids overloads that can be experienced when standard high sensitivity microphones measure pressure over 136 dB. Measuring up to 160 dB while maintaining 19 dBA noise floor, Model 377A21 is suited for automotive cabin noise measurement, environmental monitoring, and reverberation room testing.