[matheusmoreira]

It tells you for how long the time displayed by the watch is valid. If a watch loses ten seconds per day, in a month it will be about five minutes off.

The objective is to minimize this number as much as possible. The open source sensor watch has a temperature sensor and software which turns it into a temperature compensated quartz watch. Mine loses time every year instead of every day or every month.

[coredog64]

Practically speaking, unless you only own a single mechanical watch you really only care about the per day loss.

[myself248]

You know what they say. Man with one clock, always knows what time it is.

Man with two clocks, never quite sure...

[tylerjaywood]

This is my motto (data engineer frequently dealing with "but this source says...")

[matheusmoreira]

Are there reasons to worry about the accuracy of a watch one is not actively using?