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Watch timing machine
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<p>A watch timing machine or timegrapher is a machine that acoustically measures the ticks of a mechanical <a href="/facts/Watch/PuFUMNTl">watch</a> to assess its accuracy and enable calibration. This device calculates the <a href="/facts/Amplitude/aEckuXJM">amplitude</a>, beat rate, and beat error of a mechanical watch, and provides a summary of these figures after the watch is connected to the device for a fixed interval of time. The information recorded by this instrument is used by <a href="/facts/Horologists/u8CzMt1a">horologists</a> and <a href="/facts/Watchmaker/VvCQx4zk">watchmakers</a> to help determine if the timepiece's <a href="/facts/Movement_(clockwork)/G7CES9vo">movement</a> is in need of servicing, or a complete overhaul, to restore its <a href="/facts/Timekeeper/VRe41Is3">timekeeping</a> accuracy. It is also used to determine if a newly produced timepiece is accurate, prior to being sold or released. </p>