The 40DD is an IEC 61094 1/8" prepolarized pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. Its tiny size allows it to be used for measuring very high frequency sounds without disturbing the sound field. It can measure sound pressure levels up to 174 dB in the range of 6 Hz to 140 kHz.

Measurement Microphone Cartridges - GOmeasure

GRAS音响，麦克风，密封套型号大全GRAS*授权代理-公司动态-上海申思特自动化设备有限公司手机版

Catalogues DirectIndustry Ranking: G

1/8 CCP Pressure Standard Microphone Set - 46DE

1-inch Laboratory STD., Pressure Microphone Type 40EU - G.R.A.S. Sound & Vibration - PDF Catalogs, Technical Documentation

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G.R.A.S. 40DD 1/8 Prepolarized Pressure Microphone - G.R.A.S. Sound & Vibration - PDF Catalogs, Technical Documentation

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GRAS 40DD 1/8 Prepolarized Pressure Microphone - GOmeasure

Measurement microphone sets – Audio Measuring