scientific glass caffeine beaker mug (400ml) american scientific caffeine molecule beaker mug with handle graduated 350ml (400ml volume) great way for a chemist to start their day! a caffeine molecule diagram adorns this clever glass mug. what a great gift for a teacher, student, doctor or anyone interested in the science field. this mug can be used in the lab or kitchen to handle hot or cold liquids. beaker mug has a sturdy handle, a total of 400ml with graduations up to 350ml. made from borosilicate glass for easy and safe reheating. colors are assorted and chosen at random.