Timegrapher
Also called timing machine
A timegrapher is a device that listens to a mechanical movement and reports its rate, amplitude, and beat error, giving a quick picture of how well it's running.
For a dealer, it's one of the most useful tools at intake. In a minute or two, it can show whether a watch is running within a reasonable range or is likely due a service.
Test in more than one position and at full wind for a fairer picture, and treat the reading as a screening tool rather than a full diagnosis.
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