The multitude of different work steps in the laboratory environment demands a multitude of universally applicable glassware. These glass devices usually have a very simple shape and are characterized by their versatility. Watch glasses, for example, are concave curved. The small trough created in this way allows liquids or solids to be filled in. The concave shape of the watch glass dish allow working in very small quantities (e.g. for pretreatments) and covering laboratory glassware with wide openings.