Watch Glasses (Beaker Covers) 5 (12.5cm) - Pack of 12 Watch glasses are highly functional laboratory glassware that have a variety of uses in the classroom or lab. The concave dishes work well as lids for flasks and beakers or for holding small samples for observation under a low-power microscope. Also useful for evaporating liquids off of samples (i.e. growing seed crystals). They can be used for making lenses of ice or other liquids. Eisco watch glasses are manufactured with sturdiness in mind. Their 2.0 mm thick construction resists shattering. And as they have ground edges as well as a polished surface you can be sure that they are a safe product to handle in the classroom or the lab. Eisco Labs proudly manufactures its own products using state-of-the-art equipment and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.