WIGGENS flat-bottomed Dewar flask has a flat bottom, which is especially suitable for use with an electromagnetic stirrer, and is easy and quick to use. It is suitable for storing low-temperature products such as liquid nitrogen and dry ice. The flat-bottomed Dewar can also be used to freeze and store a small amount of samples in the laboratory. The cover is optional to prevent evaporation. The cover is made of porous heat-insulating and anti-evaporation material. There are Dewar models with observation windows on the side to choose from. Aluminum shell, not easy to rust.