Digital indicators can be adapted to different applications. In addition to the indication of measured values, digital indicators can also be used for control works or as transducers.

A PID controller is an instrument used in industrial control applications to regulate temperature, flow, pressure, speed, and other process variables. … PID control uses closed-loop control feedback to keep the actual output from a process as close to the target or setpoint output as possible.

A Counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred, often in relationship to a clock. The most common type is a sequential digital logic circuit with an input line called the clock and multiple output lines.