Tube furnace is a box type table top unit with PID digital controller that is installed at the base of chamber controls heat temperature, air flow, pressure and speed. FeCrAl alloy molded heating element provides intermediate electric resistance and withstand high temperature. Security system works with an outdoor double-case and strengthens itself with adiabatic materials. Safety devices include ELB ( elastic load balancing ) and overheating protection system for end user safety.