94dB and 114dB Sound Calibration at 1KHz Accurate and Simple to use Fits 1", 1/2" or 1/4" diameter microphone
Setting standard sound level at 94dB and 114dB.According Standard ANSI S1 4-1984 and IEC 942 1988 Class 21/2 inch microphone adapters provided.Low battery indicator. Class 2 Dual Level Calibrator