Frequency meters are instruments that provide analog outputs as frequencies that vary as a function of the applied input.

Sound level meters and noise dosimeters are used in sound and noise analysis.

Audio transducers and buzzers are used in electronic equipment, toys and various warning devices as the sounding component

Signal generators and waveform generators are used to test and align all types of transmitters and receivers, to measure frequency and to generate a signal, waveform or noise source.

Phase meters (phase testers, phase rotation meters) check the phase sequence and phase orientation in three-phase electrical systems

Harmonic distortion and phase meters are instruments that measure harmonic distortion or phase position

Spectrum analyzers and signal analyzers display raw, unprocessed signal information such as voltage, power, period, wave shape, sidebands, and frequency.