... 1. Cost lowering through nitrogen (N2) gas replacement and combination N2 with other substance.2. Clearndicated, Convenient display ... humidity.6. Power disribution lamp and in operation lamp.7. Sturdy and durable shelf is movable up and down.8. Most economical, ... audiovisual, precise instruments, food, paper materials, films, chemical and medical materials, ect.12. Warranty: 2 years free maintenance ...