In the column 1 of chart the design attribute are given, while column two gives key design features and sub-features that should be consider during design process. The 3rd column gives the expected likelihoods. The outer most blocks represents the housing of to temperature chamber. Its functions is to accommodate internal chambers and control circuitry and protect them against outside environmental factors. Inside the main block we have vapor-tight interior steel liner. The 100% stainless steel liner provides strength to outside housing and a non-corrosive atmosphere to internal chambers and control circuitry. The alpha numeric display is visualize outside the main block. The arrow head represents its linkage with main control system. Chamber control system provide fully automatic PID through user-friendly alpha numeric display.