Mainframe construction with high quality approved by all safety requirements. Panel with modularity design and easy to maintain, dismantle and repair. Multiple specifications and easy to expand during require. Good mobility mainframe and easy to handle. PID control with high accuracy. Auto or Manual function can be operated directly from the panel key. With preheat & drying functions to ensure the long life heater. Panel with modularity design, easy dismantle and repair PCB. Detection Thermocouple short circuit/open circuit and reversed breakdown signal. New additional "Boost" manual function, moment heat up. New additional "Standby" manual function with standby key and rest key. New additional "Abort" upper limits function. Popularited operation interface, shorten learning time. New safety designs to ensure the lowest human negligence accident.