1.Interior of oven is made of specular stainless steel by argon-arc-welding technics, and the exterior of oven is made of high-quality steel sheet with a beautiful and novel appearance.                                                                   2.Microprocessor PID temperature controller with temperature control protection, digits display and timing function ensures a precise and reliable temperature control.(intelligent programmable LCD temperature cone roller is an option)                          3.Hot-air circulating system consists of a fan keeping running under a high temperature and proper air ducts to ensure a uniform distribution a high temperature in chamber.                                                                            4.Independent alarm system for temperature-limiting ensures experiments run safely and no accident would happen.(Option)       5.Recorder and printer are options which can print or record set parameters and trace variation curves of temperature.(Option)