Digital bargraphs measure process and electrical variables such as pressure, flow, temperature, speed, current, and voltage.

Bar graph arrays are light emitting diodes (LEDs) that are used for solid state metering in applications such as audio monitoring, telecommunications, and instrumentation.

VU meters measure the volume (intensity) of analog audio signals.

Liquid crystal display (LCD) modules are used at the component level in place of less efficient displays such as cathode ray tubes (CRTs).

Digital panel meters measure and display processes and electrical variables via an alphanumeric digital readout.

Light-emitting diodes (LED) are PN junction devices that give off light radiation when biased in the forward direction.

Digital LED displays are segmented or dot matrix displays allowing for numeric only and alphanumeric character representation