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
Watch Glass, 100 mm, Borosilicate Glass | Flinn Scientific
Always in Stock - Cole-Parmer Essentials Watch Glass, 75 mm, fits 250 mL beakers, 12/pk from Cole-Parmer