Geophones are small, vibration sensing instruments that are used to measure movement of the earth, machines, mines, and other applications

Vibration sensors cover sensors and other instruments used for measuring vibration and acceleration.

Specialized audio equipment is used in specific industries such as the recording industry, and for specialized applications such as voice digitizing and analysis.

Audio microphones are designed for sound reception and recording applications (speech and music).

Antennas are structures or devices used to collect or radiate electromagnetic waves.

Audio amplifiers and preamplifiers are units that amplify a sound signal, which is then sent to a speaker or another amplifier.

MEMS processing equipment is used to create micro-electro-mechanical systems (MEMS) sensors and wafers.

Hydrophones are underwater acoustic sensors used in marine research, undersea mapping and navigation, and various commercial and military applications.

Measurement microphones are most commonly condenser microphones, which convert sound pressure to an output that is then converted into a reading such as sound pressure level (SPL).