Brüel & Kjær produce a wide spectrum of microphones for any given measurement task. Four types of microphones define the measurement flexibility and adaptability for specific environments, industries, and measurement conditions; refereed to as free-field, pressure-field, diffuse field and special microphone. In addition our condenser microphones are supplied polarized or prepolarized and in sizes ranging from 1-inch, 1/2 inch, 1/4 inch or 1/8 inch in diameter.