... .Get CE, ROSH and UL certification 4.WAVELENGTH :635-680MM visual fault detection tester , led tester , remote tester The NS-LS650M ... ; Finding the faults of OTDR dead zone; End- to- end visual fiber identification.SPECIFICATIONS:1,PRODUCT FEATURES:2,SMALL SIZE, EASY ... * 2(NS-LS650M),AA * 2(NS-LS650P) NS-LS650M/P Visual Fault Detection Tester