Electronic counters and timers are completely electronic units with a variety of features and functions; they may be programmable via computer interface.  Electronic counters and electronic timers can be single or multi function units.  Electronic counting functions may include: mathematical operations, control functions, batch counting, totalizing, event counting, preset or predetermining counting, pulse counting, up/down/bi-directional counting, frequency counting, or position indication.  Electronic timer functions may include: time indication (such as in time meters and clocks), and rate indication (such as tachometers).