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.

Vacuum fluorescent displays (VFD) provide high brightness, wide viewing angles, and relatively low cost

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

Level sensors are used to detect liquid or powder levels, or interfaces between liquids.

Liquid level sensors are used to detect liquid levels or interfaces between liquids such as oil and water or liquids and solids.

Level controllers monitor, regulate, and control liquid or solid levels in a process.