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Stopwatch Calibrator is a precision instrument used to verify and calibrate the accuracy of stopwatches, timers, and other time-measuring devices. It ensures that these devices provide accurate time measurements, essential in applications where precise timing is critical, such as in sports, laboratories, or industrial processes. The calibrator typically features high-precision time sources, such as atomic clocks or GPS time signals, and allows for real-time comparison with the stopwatch being tested.