Dayton EMM-6 measurement microphone, calibrated by Cross-Spectrum Labs
Digital Sound Level Meter Calibrator 94db & 114db For 1/2" And 1" Inch Microphone, Professional Noise Decibel Calibration Tool - Sound Level Meters - AliExpress
Audyssey Unveils New Individually Calibrated Microphones for Use with MultEQ-X - Audyssey Laboratories
Testing 1-2: New Laser-Based Microphone Calibration Measures Up | NIST
Acoustic Calibration Systems | PCB Piezotronics
Testing 1-2: New Laser-Based Microphone Calibration Measures Up | NIST
Dayton Audio UMM-6 USB Measurement Microphone
SC-1 Microphone Calibrator from ISEMcon – Rational Acoustics
Digital Sound Level Meter Calibrator 94dB & 114dB for 1/2" and 1" Inch Microphone Portable W/ Backlight Calibration Tool Sound Level Calibrator ND9a ND9b - China Sound Level Calibrator and Calibration Tool
Audio Analysis Tools, Part 2 – FOH | Front of House Magazine
Amazon.com: Sound Level Meter Acoustical Calibrator 94dB & 114dB output levels for 1 inch and 1/2 inch mic : Industrial & Scientific
Using a microphone calibrator | Super Best Audio Friends