Both electromechanical and electronic types. Electromechanical types: pulse counters and hour meters, plus one instrument that combines both functions. These devices can be equipped of front side mechanical reset or without when the total count need to be always incremented or in order to prevent tampering. Electronic types: featuring different functionalities such as pulse counting, preset counting, timing, preset timing, frequency and speed measuring. These instruments are available with the single required function or multifunction where the instrument can be programmed to read the required signal.