The total deviation in timekeeping between the first snapshot & the most recent.
Evaluate
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Track the accuracy of the timepiece 
as more snapshots are added.
Most Recent Rate
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Average Rate
For nearly half a century, the highest standard of accuracy for Swiss watches has been evaluated using cameras synchronized to precise clocks.

 
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Cumulative Rate
Take a snapshot of the dial of an analog clock or watch.
The rate of accuracy in timekeeping between the two most recent snapshots.
Track the accuracy of multiple timepieces. 
M
ultiple ways.
Record the position of the hands.
An average of all of the recorded rates for a given timepiece.
Capture
Record