Counter and timer boards are computer cards that perform digital counting and/or timing functions

Electronic counters and electronic timers are completely electronic units for performing a variety of counter or timer functions

Electromechanical counters and electromechanical timers accept inputs to operate mechanical display, such as rotating wheels or knobs

Time delay relays and solid state timers use solid state electronic devices to provide a time delay

Mechanical counters are used to detect, totalize and indicate a sequence of events in applications that do not use electrical power

Mechanical timers are used to actuate devices at the end of a specified time period.

Digital counters are integrated circuits used for counting events in computers and other digital systems