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Mechanical stop clock metal core physics experiment equipment teaching instrument chronograph stopwatch 60s0.2s

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physical experiment equipment Mechanical stop clock metal core physics experiment equipment teaching instrument chronograph

physical experiment equipment Mechanical stop clock metal core physics experiment equipment teaching instrument chronograph

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Mechanical Stop Clock Stopwatch Timing 60s 0.1s Physics Teaching Instrument Mechanical Clock Stopwatch Physics Experiment Timer

Mechanical stop clock stop clock 60s0.1s physics teaching instrument timing stop clock stopwatch teaching aids equipment

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Mechanical stop clock stop clock 60s0.1s physics teaching instrument timing stop clock stopwatch teaching aids equipment

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