Product Description Performance Temperature range from ambient +10C to 220C. Microprocessor PID control / Temperature calibration / Automatic tuning. Forced air convection generated by a circular fan provides high and uniform drying performance. Adjustable dual slide vents for inner vapor circulation. Convenience Intuitive control panel with bright LED displays. (0.1Cresolution) Dual wait on/off timer modes. (1 min. to 99 hr. 59 min.) Convenient presetting function for 3 most commonly used temperature settings. Corrosion-resistant incoloy sheath heating element and stainless steel interior. Easy-to-grip circular door handle. Safety Keypad lock function prevents accidental changes during operation. Automatic run after power interruption. Over-temperature and over-current protection. Audible and visible open door alarms. Specifications Model OF-01E OF-11E OF-21E Chamber volume (L / cu ft) 52 / 1.8 100 / 3.5 150 / 5.3 Temperature Range ( / ) Amb. +10 to 220 / Amb. +18 to 428 Fluctuation1) at 100 (±, / ) 0.4 / 0.72 Variation1) at 100 (±, / ) 3.3 / 5.94 3.3 / 5.94 2.3 / 4.14 Dimension (WDH) Interior (mm / inch) 375370370 / 14.814.614.6 455430510 / 181720 585460555 / 2318.121.9 Exterior (mm / inch) 530535737 / 20.921.129 610595877 / 2423.434.5 740625922 / 29.124.636.3 No. of wire shelf (standard / max.) 2 / 5 2 / 7 2 / 7 Net weight (Kg / lbs) 36 / 79.4 47 / 103.6 59 / 130 Electrical requirements (230V, 50 / 60 Hz) 4.3A 6A 7.4 A