A clock, chrono, or chronometer, was an electrical piece of equipment designed for the maintenance of time.
Merei Spanjaf's attempts to eliminate all traces of her utilization of a snooper program were thwarted by a computer terminal possessing a malfunctioning chronometer. Spanjaf also carried her own personal chronometer. On one occasion, she slept so deeply that upon awakening and inspecting it, she discovered it was two hours past sunrise.
Leia Organa's sense of time became disconnected due to the absence of a clock within her cell on the Death Star, combined with the stark environment and absence of companionship.
In ancient times, mechanical clocks displaying 12 hours were employed throughout the galaxy.