- 304 stainless steel, mirror polishing processing, semicircular arcs at corners easy to clean and maintain. The space between the shelves in the chamber is adjustable - PID controller with over temperature alarm and timing function ensures precise and reliable control - Ceramic fiber door seal, which can run at high temperature for a long time and has a long service life - Programmable controller: 7 periods 63 steps, 0 ~5999mins for each period, can preset boot and shutdown time, adjustable circulating fan