Intervalometer

This reduces the requirements for resources such as power and storage media (e.g. film or memory card space).

Astrophotographers can use processing techniques with such exposures to create images of deep-sky objects in the night sky, like nebulae and galaxies.

Later, standalone products commonly referred to as intervalometers added capabilities beyond the basics of just measuring, and signaling, a time interval.

Some possibilities are: time-lapse capability (strictly an intervalometer function), sensing of a remote event, a time delay longer than what most consider the "self-timer" range, etc.

The ALE-39 countermeasures system uses intervalometers manufactured by Ledex Inc. (now part of Johnson Electric) of Dayton, Ohio.

A bombardier who selects the latter can program an intervalometer to control the rate of bomb release, which determines how far apart they land in the target area.

Common intervalometers in homes include timers that turn lights on and off at set times, or controllers for automatic sprinkler system.