Operating features   • 4°C to 60°C   • Microprocess PID control/ Auto-tuning/ Calibration   • Digital timer: 1 min to 99 hr 59 min, delayed ON/ OFF   • Over-temperature limiter/ Door opening alarm   • 3 different temperature values memorable without auto-tuning   • 9 steps of temperature profiles programmable and repeat up to 200 cycles   • Adjustable fan speed within 3 steps and defrosting time/ period control   • Digital LED display (0.1°C resolution) with touch-sensitive keypads   • RS-232 interface available   Constructional features   • Air-jacketed type: outer heat exchange and inner gravity convection independently   • Enough capacity - large size of chambers with maximum 254L (9cu ft)   • One electrical outlet with safety cover allows use of other electric instruments in the chamber   • Optimized sample inspection through tempered inner glass door without affecting chamber temperature   • Separable shelf and rounded inner chamber corners for easy cleaning