General Timekeeping:
* Clock: This is the most general antonym, but it encompasses a wide range of devices, from basic wall clocks to digital watches.
* Watch: A more specific alternative to "clock", referring to a wearable timekeeping device.
* Timer: This refers to a device that measures specific durations rather than providing a continuous display of time.
Inaccurate Timekeeping:
* Sundial: A simple timekeeping device based on the sun's position, but much less accurate than a chronometer.
* Hourglass: Another simple timekeeping device that measures time by the flow of sand, also lacking the precision of a chronometer.
* Timekeeper (informal): This can be used to describe any device that measures time, but it doesn't necessarily imply high accuracy.
Lack of Time Measurement:
* Calendar: This focuses on dates and events rather than the actual passage of time.
* Almanac: A reference book that provides information about dates and events, similar to a calendar.
The best antonym for "chronometer" will ultimately depend on the specific context in which you are using it.