Watch glass ? = 90 mm A clock glass is a kind of laboratory glassware, shaped like a round section of the sphere.
The glass crystal is mainly used in laboratories: • as a basis for performing simple, drop chemical tests • as a base for other types of experiments - for example for observing solubility or crystallization • as a lid for beakers and crystallizers • as a kind of weighing bottles for weighing small amounts of loose substances. / below: photos of three sizes of slides: 45, 60 and 90 mm /


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