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$24.84Mechanical Stop Watch, Round Dial 0.2s 60 Second Mechanical Stopwatch, Sports Count Timer for Physical Experiments Running Cycling J01205, Chronograph Running Timer HandheldAmazon- $17.8910pcs Watch Glass Watch Tool Watch Glass Laboratory Glass Evaporating Dish Evaporating Dish Chemistry Experiment Watch Glasses Tool Watch Glass for Laboratory Watch GlassesAmazon
- $13.39SOLUSTRE Experiment Watch Tool 1pc PTFE Watch Glass Porcelain F4 White Round Teaching Tool WatchAmazon
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