If the floor is part of the air handling system, probe microphones or fiber-optic microphones can be effective.

Surveillance can be accomplished by direct listening or with probe microphones or vibration devices within the duct where they are not visible for inspection.

We recommend that fitting be based on these REAGs, using a probe microphone system for verification and adjustment where necessary to achieve the target values.

Minimal audible pressure involves presenting stimuli via headphones or earphones and measuring sound pressure in the subject's ear canal using a very small probe microphone.

Thomas Wilson, an acoustical engineer and group marketing manager at Bose, said that the system was partly tested by inserting probe microphones into people's ear canals.

The HRTF can be measured by placing miniature probe microphones into the subject's ears and recording the impulse responses to broad-band sounds presented from a range of directions in space.

Real ear measurements (or probe microphone measurements) are an assessment of the characteristics of hearing aid amplification near the ear drum using a silicone probe tube microphone.

Real ear measurement (REM, also known as insitu- or probe microphone measurement) is the measurement of sound pressure level in a patient's ear canal developed when a hearing aid is worn.