First of all, check the pros and cons of the material, open the lid of the kettle, and smell the odor in the pot. All odors will be shot. Then check the sealing performance, seal the lid, pressurize the kettle body with moderate force, and listen for leaks. If you are familiar with your boss, it is best to take a try. Finally, look at the making process of the pot (whether the pot wall thickness is consistent, with or without trachoma).