Amazon.com: Sound Level Calibrator,Decibel Meter Calibration with Noise Measurement Reader,Output Sound Level 94dB & 114dB output levels for 1 inch and 1/2 inch Microphones : Industrial & Scientific
Metrosonics db-3070 Sound Level Meter » ToolingCrib.com
Amazon.com: Sound Level Meter Acoustical Calibrator 94dB & 114dB output levels for 1 inch and 1/2 inch mic : Industrial & Scientific