Product Description 1. 4-sides Heating method, Temperature conduction by shelves, more efficiency. 2.With inflatable port, once-forming thermostability silica gel Sealant strip, with good tightness. 3. Double Observation glass window, inner is explosion - proof glass, outside is resin protection plate, more safety. 4. Fastening handle, convenient for opening and closing. 5. LCD controller, multiple groups of date 3 display on one screen, intelligent PID control system, with PT100 sensor. 6. LCD vacuum gauge, accuracy class 0.5, Mpa, Kpa, bar, Psi, KGF/cm2 five pressure units optional switch.