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

Digital multimeters (or multi-meters) are used to measure electrical quantities such as voltage, current, resistance, frequency, temperature, capacitance, and time period measurements.

Metal rod and bar stock are metals and alloys in the form of round bars or rod, square bars, rectangular or flat bars, hexagons, and other bar stock shapes

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

Hand held bar code scanners are used typically as inventory or point of sale (POS) devices.

Bar code scanners are designed to read imprinted bar / matrix code symbologies.

Slot card bar code scanners are designed to read imprinted bar code cards that are passed through the aperture on the reader