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(eBay) Mechanical Watch Weishi Timing Tester Machine Multifunction Timegrapher NO.1900 | Tester, Mechanic, Mechanical watch
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an image of a watch timer with the words watch timekeeper and instructions on it
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(eBay) No.1900 Mechanical Watch Timing Tester Tools Timegrapher Multifunction Machine A

(eBay) The frequency diagram of the watch can be displayed on the LCD screen. Relative humidity: 0~80% RH. The sampling period can be selected by 2 seconds, 4 seconds, 6 seconds, 8 seconds, 12 seconds, 20 seconds, 30 seconds, 60 seconds, and the average value of corresponding period will be regarded as the precise value of the watch.
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