Perfect Performance Max. Temp. 250?, ±0.2 ? accuracy & ±3.0 ? uniformity. Heat transduct from heater though aluminum shelve Digital PID Controller by 0.1? resolution control Over temperature protection, alarm, auto-tuning & timer Convenience Integreated control system with temperature controller, Vacuum Gauge & 3-Way valve One touch door catch 15mm thick tempered safety glass window Easy to use ? sliding aluminum shelve