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Young4us Watch Glass Beaker Cover Set, 6 Pcs Lab Watch Glasses in 150mm, 100mm, 70mm for Laboratory, Science and Chemical Experiment (150 mm x 2, 100 mm x 2, 70 mm x 2): Amazon.com: Industrial & Scientific
Place a sample of tap water on a clean watch glass and place it over a beaker containing water, as shown in Tap water - Sarthaks eConnect | Largest Online Education Community
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Genuine BERGEON (Swiss) Ref. 7971 Watch Glass, Dial & Hand Cleaning Pen Tool & Replacement Tips – Localtime Watches, Straps & Accessories
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