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

Analog panel meters measure and display processes and electrical variables with a simple dial display

Phase-locked loop (PLL) frequency synthesizers are electronic devices that produce frequencies coherent to a reference frequency

Frequency counters are digital indicating meters for accurate measurement and display of square wave and pulse input signals

Conductivity meters, dissolved solids meters, and resistivity meters are analytical instruments that measure the conductivity, dissolved solids, and/or resistivity of a liquid sample

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

Analog multimeters are instruments that are used to measure electrical quantities such as voltage, current, resistance, frequency and signal power