Lots of things. Basically any time you might want a very shallow bowl - almost a dish. They're also sometimes used as covers for beakers.
i think a test tube
watch glass?
A watchglass can be used as a beaker cover, but you can also place small amounts of chemicals on it and then heat it (for example, to evaporate some water from a wet chemical).From Wikipedia:A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. The latter use is generally applied to prevent dust or other particles entering the beaker; the watch glass does not completely seal the beaker, and so gas exchanges still occur. When used as an evaporation surface, a watch glass allows closer observation of precipitates or crystallisation, and can be placed on a surface of contrasting colour to improve the visibility overall. Watch glasses are so named because they are identical to the glass used for the front of old-fashioned pocket watches. In reference to this, large watch glasses are occasionally known as clock glasses.See the Related Questions and Web Links to the left for a picture of watch glass and more information about other laboratory apparatus.
A watch glass is a circular, concave-shaped piece of glass often used in chemistry labs to cover beakers or evaporating dishes. A container, on the other hand, is a generic term for any object used to hold something. While a watch glass can be used as a container in certain contexts, the two terms are not always interchangeable.
dropper! i believe your refering to a watch glass
They were used in catherdals and they were used to watch Netflix
Jim sold his watch and used the money from the sale to purchase a pier glass for his wife as a gift.
Distilled water is used in watch glass cleaning because it is free from impurities that could leave residue or damage the glass. It helps ensure that the watch glass is thoroughly cleaned without leaving streaks or spots behind.
real 3d
A watch glass hasn't a symbol.
A "crystal" is the transparent cover used to protect a watch's dial and hands. It is mounted in the "bezel" at the front of the case. It is most commonly made from glass, but the more scratch-resistant sapphire is preferred.
A watch glass is sometimes used to measure small amounts of solids and evaporate miscellaneous liquids/ chemicals in a laboratory.