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stonyLab watch glass is a curved circular glass disc used in laboratories as a surface for holding or mixing small quantities of liquids or powders Commonly used in scientific experiments and laboratory procedures, such as evaporating solvents or heating small samples; can also be used as a lid for beakers, evaporating dishes and other containers 10 pack; 70 mm diameter; thickness: 2 mm; Note: manual measurement allows 1-2mm error Well-crafted with borosilicate glass; featuring a smooth surface and high degree of transparency; note: cannot be heated directly Warranty: StonyLab provides premium products and professional customer service; if received damaged, please contact us immediately; we will solve it until satisfied