Electronic and electromechanical counters are used to keep track of a total number of events or to present an output at a predetermined number of events.

Electronic and electromechanical counters accept inputs and increment the counter each time a pulse is received. Using sensors, switches, encoders and relays, counters can keep track of a wide variety of events including the product of individual components in a manufacturing process, or the length of wire pulled through a spool.

There are two primary types of counters. Totalizing counters receive inputs to register the total number of pulses and display that number in a numerical value, and predetermining counters count to a preset number and give an output.