... 1310nm,1490nm,1550nm wavelength laser output ,650nm visible laser source output optional. Using Advanced laser control technology for engineer, ... measurementand fiber sensing, etc.FeaturesChinese and English menuHigh stability source output ,1310/1490/1550nm wavelength for PON systemOutput power ... fiber fault within 20KMAuto off setting time , backlight auto-off or manual on/offTwo AA batteries, easy to ...