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

Message LED displays are typically commercial or industrial signs.

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

Flat panel displays (FPDs) are thin, flat, electronic devices used to display data.

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

Temperature instruments use contact or noncontact methods to measure temperature.