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 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

Fixed mount bar code scanners are designed to manually or mechanically read items passed by their scan windows.

Bar code printers are used to output bar code data in printed form