... sturdy and durableSIX:Equipment Installation And InspectionOpen the therapy apparatus,load liquid nitrogen,tighten.Install the ... to dermatologic , ophthalmologic,ophthalmologicandotorhinolaryngologic,anorectal, gynecologic, oncologic therapy.Two:Work PrincipleDZ_4 low temperature treatment instrument uses ... cold service.Set the cold head on proper therapy temperature when using.Freeze the focus when ...