The glass beaker is made of 3.3 high borosilicate glass, heat-resistant to sudden changes of 200 ℃, with a four specification set of 50 mL-500 mL. It has dual scale lines with an accuracy of ± 5%, and the white enamel marking area can be written with a pencil. Conical mouth with guide nozzle, no dripping or leakage during pouring; The bottom is frosted and non slip, and can be directly heated or magnetically stirred. Equipped with a silicone sheath, it is heat-resistant and shatterproof, meeting the safety requirements for classroom demonstrations and group experiments. It is a must-have for basic physical, chemical, and biological experiments.