MM 1

The Beyerdynamic MM-1 is the ideal microphone for measuring frequency response and sound pressure levels in research, development, and reverberation testing, as well as for calibrating sound reinforcement and PA systems. The MM-1 provides you with remarkably natural reproduction, thanks to its linear frequency response. On top of that, its narrow tubular construction minimizes its influence on your sound field. At Sweetwater, we've found the Beyerdynamic MM-1 measurement microphone to be an indispensable and phenomenally accurate tool. If you're searching for a measurement mic, you can't go wrong with this one.
Beyerdynamic MM-1 Measurement Microphone Features at a Glance:
Linear frequency response provides natural reproduction
Narrow tubular construction minimizes influence on your sound field
Omnidirectional polar pattern eliminates proximity effect