Microphone Bruel and Kjær model 4939

Free-field ¼-inch Microphone — Type 4939
The Free-field ¼??Microphone is specially designed for high level and high frequency measurements.
By using stainless steel diaphragm and protection grid, the microphone is optimised to withstand rough environments and is capable of working at high temperatures – up to 150 C (302 F).

USES
m High level measurements
m High frequency measurements
m Model work

FEATURES
m Sensitivity: 4 mV/Pa
m Frequency: 4 – 100,000 Hz